We use cookies to show content based on your preferences. If you continue to browse you accept their use and installation. More information. >

FMF - Friends of Minerals Forum, discussion and message board
The place to share your mineralogical experiences


Spanish message board






Newest topics and users posts
18 Mar-08:12:52 Green seam. Looks like it in a state of decay. (Ning)
18 Mar-06:47:13 Mineralogy & museums 10 - cardiff - 12th-13th august 2024 (Roy Starkey)
18 Mar-02:50:32 Re: collection from dany mabillard (Dany Mabillard)
17 Mar-01:57:58 Re: collection of volkmar stingl (Volkmar Stingl)
15 Mar-14:27:47 Re: collection of philippe durand (Philippe Durand)
15 Mar-13:49:04 Re: collection of firmo espinar (Firmo Espinar)
15 Mar-09:18:42 Re: collection of michael shaw (Michael Shaw)
15 Mar-03:45:43 The mizunaka collection - rhodochrosite (Am Mizunaka)
14 Mar-21:29:31 Re: monthly mineral chronicles, mineral guides and more... (Crocoite)
14 Mar-14:47:27 Re: collection of philippe durand (Jordi Fabre)
14 Mar-13:56:01 Re: collection of philippe durand (Philippe Durand)
14 Mar-11:24:43 Re: collection of philippe durand (Jordi Fabre)
14 Mar-08:55:22 Re: collection of michael shaw (Michael Shaw)
14 Mar-08:44:47 Re: the mim museum in beirut, lebanon (Mim Museum)
14 Mar-07:24:12 Re: collection of volkmar stingl (Volkmar Stingl)
14 Mar-02:30:15 The mizunaka collection - quartz (Am Mizunaka)
14 Mar-02:20:37 Re: collection of volkmar stingl (Tobi)
13 Mar-23:40:08 Re: collection of volkmar stingl (Volkmar Stingl)
13 Mar-14:22:58 Re: don lum collection (Don Lum)
13 Mar-14:02:43 Re: collection of philippe durand (Philippe Durand)
13 Mar-00:57:48 The mizunaka collection - quartz (Am Mizunaka)
12 Mar-07:36:06 Re: can you recommend a lab to analyse specimens (Luiz Oliveira)
11 Mar-16:19:18 Re: collection of philippe durand (Riccardo Modanesi)
11 Mar-15:18:26 Re: collection of philippe durand (Philippe Durand)
11 Mar-15:13:07 Re: collection of philippe durand (Philippe Durand)

For lists of newest topics and postings click here


RSS RSS

View unanswered posts

Why and how to register

Index Index
 FAQFAQ RegisterRegister  Log inLog in
 {Forgotten your password?}Forgotten your password?  

Like
111630


The time now is Mar 18, 2024 21:33

Search for a textSearch for a text   

A general guide for using the Forum with some rules and tips
The information provided within this Forum about localities is only given to allow reference to them. Any visit to any of the localities requires you to obtain full permission and relevant information prior to your visit. FMF is strictly against any illicit activities related to collecting minerals.
Faden Quartz Crystals - (26)
  Goto page Previous  1, 2, 3, 4  Next
  Index -> Featured Columns of FMF
Like
139


View previous topic :: View next topic  
Author Message

Harjo




Joined: 04 Nov 2009
Posts: 32
Location: Vessem


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Dec 30, 2016 17:53    Post subject: Re: Faden Quartz Crystals - (26)  

Just as an illustration...here is a nice curved fadenquartz from Bierghes, Belgium.
I found many curved fadenquartzes in one specific cleft, hardly any in many other nearby clefts. The curvature of the faden most likely depended on the direction in which the specific cleft opened but it puzzles me why the curved fadens were restricted to merely one cleft.
We collected them from a cleft in a series if typical Scherklüfte, schearing clefts, which tend to form in rows of similarly orientated clefts.



fad5.jpg
 Mineral: Quartz (variety faden)
 Locality:
Quenast, Rebecq, Nivelles District, Walloon Brabant Province, Wallonne Region, Belgium
 Dimensions: 13.5 cm
 Description:
 Viewed:  28095 Time(s)

fad5.jpg


Back to top
Reply to topic Reply with quote
Like
5
   

Harjo




Joined: 04 Nov 2009
Posts: 32
Location: Vessem


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Dec 30, 2016 17:54    Post subject: Re: Faden Quartz Crystals - (26)  

Another quite interesting fadenquartz from the same locality


faden2kl.jpg
 Mineral: Quartz (variety faden)
 Locality:
Quenast, Rebecq, Nivelles District, Walloon Brabant Province, Wallonne Region, Belgium
 Dimensions: 3cm
 Description:
 Viewed:  28067 Time(s)

faden2kl.jpg


Back to top
Reply to topic Reply with quote
Like
4
   

alfredo
Site Admin



Joined: 30 Jan 2008
Posts: 977


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Dec 30, 2016 17:56    Post subject: Re: Faden Quartz Crystals - (26)  

I think it is mistaken to think of a long "thread" growing across a cavity, because it starts out as an extremely short thread, being just the "healing" process between the 2 parts of a cracked quartz grain in which, of course, the two halves of the broken grain have the same crystallographic orientation. As the crack continues to widen, the healing process continues and the thread gets longer. All that is necessary is for the crack to widen at a slower rate than the quartz can reheal, which would be not unexpected in an alpine tectonic setting.
Back to top
Reply to topic Reply with quote
Like
   

Harjo




Joined: 04 Nov 2009
Posts: 32
Location: Vessem


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Dec 30, 2016 18:09    Post subject: Re: Faden Quartz Crystals - (26)  

Exactly, and while expanding the fluids present cause quartz crystals to grow on the row of quartz grains, just up to the point of saturation. The orientation of the faden towards the c-axis as illustrated in the above drawings can be explained by the orientation of the grain (its crystal lattice)
But explain why only one cleft in a series of concordant shearing clefts produced the bent faden ;-)
Here's a link to a video showing another Bierghes faden peculiarity. It shows a fadenquartz which is ordinary on one side, but the single faden "sprouted" two differently orientated parallel rows of crystals on the other side. I show the video because the peculiarity doesn't come across on a photo: https://www.youtube.com/watch?v=wnNuvfh_bV8
Back to top
Reply to topic Reply with quote
Like
   

Roger Warin




Joined: 23 Jan 2013
Posts: 1171


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Jan 08, 2017 03:05    Post subject: Re: Faden Quartz Crystals - (26)  

Hi Alfredo,
I persist in the error ... I do not believe in healing process, but in an almost linear flash in a phase of saturated silica gel, set between the two walls of the cavity. The importance of silica gels in geology is underestimated
Back to top
Reply to topic Reply with quote
Like
   

Roger Warin




Joined: 23 Jan 2013
Posts: 1171


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Jan 08, 2017 03:54    Post subject: Re: Faden Quartz Crystals - (26)  

Hi,

John Kashuba (Oregon) sent me a lot of photos of Faden quartz in thin sections. To have a certain depth, he chose a thickness of 100 μm instead of 30 μm normally. Faden TS are observed in oblique incident light.



001-Faden for sectioning Text copy.jpg
 Mineral: Faden quartz
 Description:
Faden for sectioning. © J.K.
 Viewed:  27274 Time(s)

001-Faden for sectioning Text copy.jpg



002-Quartz faden lateral section T~100um, FOV=0.53mm wide P1200.jpg
 Mineral: Faden quartz
 Description:
Quartz faden lateral section T~100um, FOV=0.53mm wide P1200.
© John Kashuba.
 Viewed:  27292 Time(s)

002-Quartz faden lateral section T~100um, FOV=0.53mm wide P1200.jpg



003-Quartz faden lateral section T~100um, FOV=3.7mm wideP1200.jpg
 Mineral: Faden quartz
 Description:
Quartz faden lateral section T~100um, FOV=3.7mm wideP1200.
© John Kashuba.
 Viewed:  27287 Time(s)

003-Quartz faden lateral section T~100um, FOV=3.7mm wideP1200.jpg


Back to top
Reply to topic Reply with quote
Like
1
   

Roger Warin




Joined: 23 Jan 2013
Posts: 1171


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Jan 08, 2017 04:01    Post subject: Re: Faden Quartz Crystals - (26)  

In conclusion, John Kashuba said to me:

“The inclusions appear to be in flat planes across the entire Faden and at right angle to the length of the Faden so it appears we cannot invoke an "inclusions during episodic skeletal crystallization" mechanism. Further, I have found cross-cutting planes of inclusions that beg to be seen as off-axis breaks.”

Many thanks John.
Note: only the inclusions are visible, not the crystal
The growth seems discontinuous creating multiple microcrystals



004-Quartz faden running left-right, curtains of defects, FOV=0.44mm wide P1200x900.jpg
 Mineral: Faden
 Description:
Quartz faden running left-right, curtains of defects viewed edge-on, FOV=0.44mm wide P1200x900. Tich section (T~100µm) in oblique incident light. © John Kashuba.
 Viewed:  27273 Time(s)

004-Quartz faden running left-right, curtains of defects, FOV=0.44mm wide P1200x900.jpg


Back to top
Reply to topic Reply with quote
Like
2
   

marco campos-venuti




Joined: 09 Apr 2014
Posts: 206
Location: Sevilla


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Jan 08, 2017 09:29    Post subject: Re: Faden Quartz Crystals - (26)  

Harjo wrote:
I show the video because the peculiarity doesn't come across on a photo: https://www.youtube.com/watch?v=wnNuvfh_bV8

Your video is private.
Back to top
Reply to topic Reply with quote
Like
   

Pierre Joubert




Joined: 09 Mar 2012
Posts: 1605
Location: Western Cape


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Jan 08, 2017 12:57    Post subject: Re: Faden Quartz Crystals - (26)  

The last photograph and one of the others, looks like microscopic negative crystals with water.
_________________
Pierre Joubert


'The tree of silence bears the fruit of peace. '
Back to top
Reply to topic Reply with quote
Like
1
   

Pete Richards
Site Admin



Joined: 29 Dec 2008
Posts: 827
Location: Northeast Ohio


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Jan 08, 2017 13:23    Post subject: Re: Faden Quartz Crystals - (26)  

Pierre Joubert wrote:
The last photograph and one of the others, looks like microscopic negative crystals with water.


That's exactly what they are, water with a gas bubble.

_________________
Collecting and studying crystals with interesting habits, twinning, and epitaxy
Back to top
Reply to topic Reply with quote
Like
1
   

Pierre Joubert




Joined: 09 Mar 2012
Posts: 1605
Location: Western Cape


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Jan 08, 2017 13:37    Post subject: Re: Faden Quartz Crystals - (26)  

Pete Richards wrote:
Pierre Joubert wrote:
The last photograph and one of the others, looks like microscopic negative crystals with water.


That's exactly what they are, water with a gas bubble.


Amazing!!!

_________________
Pierre Joubert


'The tree of silence bears the fruit of peace. '
Back to top
Reply to topic Reply with quote
Like
   

Pete Richards
Site Admin



Joined: 29 Dec 2008
Posts: 827
Location: Northeast Ohio


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Jan 08, 2017 14:26    Post subject: Re: Faden Quartz Crystals - (26)  

Pierre Joubert wrote:
Pete Richards wrote:
Pierre Joubert wrote:
The last photograph and one of the others, looks like microscopic negative crystals with water.


That's exactly what they are, water with a gas bubble.


Amazing!!!


Yes, but understandable too. When fluid is trapped in a growing crystal, it is enclosed in a space in the crystal which might have any shape to start with. The bubble, being trapped, can neither grow nor shrink, but its boundary can change shape. The same crystallographic forces that cause the external shape of the crystal cause the bubble cavity to evolve toward a crystal shape by dissolving in some places and depositing in others. If there is enough time, this process reaches an end point - an equilibrium - which looks like the crystal itself.

The fluid trapped in the crystal is initially a single phase. As it cools, the liquid part of the fluid and the gas part separate, very approximately like gas evolving from a carbonated beverage, because less gas can dissolve in the liquid at lower temperatures. Since all the fluid inclusions in a local region form at the same time and trap the same fluid, they release the same amount of gas in cooling to room temperature.

So this explains why the inclusions generally have the same shape (and orientation) - a negative crystal - and all have bubbles of about the same size.

One can get an idea of the temperature at the time the fluids were trapped by heating the crystal until the gas completely dissolves into the liquid again.

_________________
Collecting and studying crystals with interesting habits, twinning, and epitaxy
Back to top
Reply to topic Reply with quote
Like
2
   

Harjo




Joined: 04 Nov 2009
Posts: 32
Location: Vessem


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Jan 08, 2017 15:38    Post subject: Re: Faden Quartz Crystals - (26)  

Now you should be able to watch the video ;-)

Back to top
Reply to topic Reply with quote
Like
   

vic rzonca




Joined: 18 Nov 2008
Posts: 820
Location: MA


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Jan 12, 2017 07:03    Post subject: Re: Faden Quartz Crystals - (26)  

Faden? Found on social media.


faden.jpg
 Description:
Rare Gwindel Quartz Crystal From Hashupi Skardu
 Viewed:  27007 Time(s)

faden.jpg


Back to top
Reply to topic Reply with quote
Like
   

Harjo




Joined: 04 Nov 2009
Posts: 32
Location: Vessem


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Jan 12, 2017 07:44    Post subject: Re: Faden Quartz Crystals - (26)  

Definitely not a Gwindel. This could be a faden crystal, but it looks more like a double terminated "rehealed" crystal. A crystal comes loose from the pocket wall and subsequently crystallisation continues (when the conditions are still favourable for crystallisation) or resumes (when the conditions become favourable again) on the fracture.
Back to top
Reply to topic Reply with quote
Like
   

GneissWare




Joined: 07 Mar 2008
Posts: 1287
Location: California


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Jan 16, 2017 11:29    Post subject: Re: Faden Quartz Crystals - (26)  

Here is an example of in situ fadens from near Quartzsite, Arizona.


rg0421c_420.jpg
 Mineral: Quartz fadens
 Locality:
Big Bertha Mine (Veta Grande Mine), Middle Camp-Oro Fino District, Dome Rock Mountains, La Paz County, Arizona, USA
 Dimensions: 181 x 161 x 84 mm
 Description:
17 mm long fadens
 Viewed:  26817 Time(s)

rg0421c_420.jpg



rg0421f_848.jpg
 Mineral: Quartz fadens
 Locality:
Big Bertha Mine (Veta Grande Mine), Middle Camp-Oro Fino District, Dome Rock Mountains, La Paz County, Arizona, USA
 Dimensions: 181 x 161 x 84 mm
 Description:
17 mm long fadens
 Viewed:  26873 Time(s)

rg0421f_848.jpg


Back to top
Reply to topic Reply with quote
Like
7
   

Philippe Durand




Joined: 10 May 2016
Posts: 628
Location: Normandie


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Jan 16, 2017 15:23    Post subject: Re: Faden Quartz Crystals - (26)  

very interesting thread; thank you for your teaching .
Back to top
Reply to topic Reply with quote
Like
   

Jordi Fabre
Overall coordinator of the Forum



Joined: 07 Aug 2006
Posts: 4888
Location: Barcelona


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Mar 27, 2017 13:51    Post subject: Faden Quartz Crystals - (26) / The Roger Warin contribution  

Is a great pleasure see discussions from FMF "externalized" in so interesting printed papers like the A.G.A.B. bulletin.

The A.G.A.B. is the prestigious association of the Belgium collectors/geologists and as you can see in the images below, there Mr. Roger Warin took what was discussed in this thread and improved it with their own thoughts.

Mr. Roger Warin and the A.G.A.B. were so kind to allows me reproduce this article here as well as kind of digest from Mr. Warin written in English language (the bulletin is published in French language) in order to make their thoughts more comprehensible for the English speakers.

I believe is a great synergy what Mr. Warin did and I encourage all the FMFers to continue this scientific and so interesting discussion.

I love science! ;-)

FADEN QUARTZ - A personal opinion


Differently inspired and in opposition to the notion of a pre-existing chalcedony soul in a hydrothermal liquid and disappointed by the classical hypothesis, while remaining sensitive to the Pete Richards’s remarks of especially on the very low frequency of the phenomenon generating the Faden quartz, I suggest that if the process of the origin of these Faden crystals is so difficult to specify, it is that one observes only the crystal. One forgets to consider the initial medium which gives birth to these “quartz à âme” (in French). As noted by Pete Richards, these environmental conditions are not frequent, and therefore the environment must be special.

In what natural laboratory are these Faden quartz synthesized? Of course, in an alpine environment, or assimilated. That is to say, where tectonics induces high temperatures and pressures conditions in which very hot hydrothermal solutions circulate. Under these parameters of environment, we must forget the notion that we have a solvent such "liquid water" at room temperature. This insipid liquid, indispensable to life, becomes a chemical reagent at high temperatures. The notions of pH differ (the corresponding theoretical notions are known) and silica SiO2 can dissolve in this liquid, which seems unlikely at ordinary temperature (for example, sand in sea). Formally, by "adding" H2O to a molecule of SiO2, H2SiO3 and H4SiO4 are obtained. The molecule H4SiO4 or Si(OH)4 is silicic acid. In a hydrothermal phase this product crosslinks, that is to say it polymerizes in all three directions to an amorphous phase of silica gel. It is bulk crystallization or a mass polymerization is carried out. This phase is more stable than imagined, so it does not lose its water below 300 °C under pressure. On the other hand, it can crystallize by abandoning crystals of a polymorphic phase of quartz, as a function of the temperature which controls the crystallization. For temperatures below 450 ° C, we obtain the quartz (alpha-quartz, which we know). Much higher temperature values than those of alpine environments would give rise to cristobalite, for example.

The composition of silica gel is based on a distribution of associated Si(OH)4 molecules and water to form [Si(OH)4]x. n H2O. This assembly is crosslinked forming a condensation product (bulk polymerization) in all three directions. Its structure is composed of SiO4 units joined by internal siloxane bridges (Si-O-Si). It is an amorphous phase. Siloxane bridges have been created by condensation of two intermediate silanol groups with loss of one molecule of water. Dry, the material is hard and porous. It is thus normally used as desiccant.
All Fadenquarz (in German) appear in an Alpine vug. This narrow cavity differs from a fault which it supposes in addition a transverse displacement of the walls. These crystals originate in an almost closed system where high temperatures and pressures prevail. This cavity is filled with a silica gel, in hydrothermal solution.

Under the effect of a large impact, for example an adiabatic expansion induced by the spacing of the walls of the diaclasis (the rupture of the box), a substantially linear ribbon appears between the two walls, consisting of individual nano-crystals (minute-crystals) of quartz. John Kashuba (Oregon) ask to cut thin sections of a specimen of Faden quartz, at the level of the core, according to his instructions (Figs 5-8). John Kashuba chose a thin section thickness of 100 μm instead of 30 μm to achieve deep microscopic vision. The observation is made in incident light to observe only the inclusions and not the crystal itself. John Kashuba concludes by saying that he sees a simple quartz crystal with a confusing network of transverse non-axial planes, filled with fluid inclusions / defects / negative crystals.

All the conditions being identical during this expansion, these microcrystals align substantially with each other (FIGS. 4, 5, 10, 15). Here we find the concept of chalcedony microcrystals proposed by Marco Campos-Venuti. A curvature will only appear if the shock wave is deflected within the silica gel. At this point, nothing favors the rapid crystallization of the gel, which has lost its internal tensions, but the shock wave is damped, the core no longer develops laterally. It is only after the amorphous mass of the rich (water saturated) silica gel enveloping the aligned nuclei that the core of silica gel continues to feed, for reasons of thermodynamic stability, the growth of several macroscopic monocrystals, which are often very clear. The existence of isolated Faden quartz, biterminated, proves that the attachment of the core at both ends is not necessary. This process is relatively rare because the feeder gel must be enclosed in a narrow jail, a sort of flattened box set between the two walls of the rock. This explanation also agrees with the parallel aggregates of Faden Quartz aligned in the vugs (or small crevices) (Figs 9 and 10).

This primordial crystallization rate is great, incorporating bubbles of fluids in the opening up of small crystal domains. In fact, these fluid inclusions would themselves originate from the crystallizing gel zone, rather than an exchange with the outside. Water and gas are released from the gel during crystallization. In practice, there would be a series of crystal lattices of substantially aligned quartz, since the flash of crystallization would not have allowed a position of equilibrium between all these micro-domains. Then, the growth of the crystal (or the crystal sequence) could resume normally, the initial stresses having disappeared. The value of this hypothesis lies in the fact that the linear germ ribbon is supported by the gel (viscous) and does not float in an aqueous (liquid) solution.

When we observe the set of substantially parallel crystal chains and perpendicular to the walls, it is also understood that these aggregates are derived from the crystallization of a mass of silica gel. A "fracture-migration" crystallization sequence does not seem consistent, whereas shocked silica gel can induce several columns of parallel Fadens in the mass. Even the texture of these aggregates is an argument in favor of our hypothesis.

In this proposed environmental context, we can think of other mechanisms of initiation of crystallization. Thus, the creation of a hydrodynamic cavitation would make it possible to induce nucleation and the direct production of crystals. This cavitation could be caused by the sudden drop in pressure, by a wave or by any impurity that strikes the silica gel. Let us not forget that the collapse of a vacuum bubble in a liquid creates a strong localized shock wave (corrosion of boat propellers).

In conclusion, we propose this new hypothesis of the origin of Faden quartz with a core based on the nature of the initial medium enclosed in a rocky pocket that receives a shock wave, either by the sudden opening or spacing of the original cavity by Tectonics, causing a sudden drop in pressure, or by another process. This medium is a silica gel, multi-crosslinked by bridges of the siloxane type and saturated with water under high temperatures and pressures.

Roger Warin



A.G.A.B. Mini Bul--March 2017--50 Year--Number 3 - Cover.jpg
 Description:
Front cover of the A.G.A.B. Mini Bul--March 2017--50 Year--Number 3
 Viewed:  26084 Time(s)

A.G.A.B. Mini Bul--March 2017--50 Year--Number 3 - Cover.jpg



L’origine-des-Faden-quartz-mars-01.jpg
 Description:
"L'Origine des Faden Quartz" by Roger Warin published on the A.G.A.B. Mini Bul--March 2017--50 Year--Number 3
 Viewed:  26019 Time(s)

L’origine-des-Faden-quartz-mars-01.jpg



L’origine-des-Faden-quartz-mars-02.jpg
 Description:
 Viewed:  26112 Time(s)

L’origine-des-Faden-quartz-mars-02.jpg



L’origine-des-Faden-quartz-mars-03.jpg
 Description:
 Viewed:  26002 Time(s)

L’origine-des-Faden-quartz-mars-03.jpg



L’origine-des-Faden-quartz-mars-04.jpg
 Description:
 Viewed:  25992 Time(s)

L’origine-des-Faden-quartz-mars-04.jpg



L’origine-des-Faden-quartz-mars-05.jpg
 Description:
 Viewed:  26092 Time(s)

L’origine-des-Faden-quartz-mars-05.jpg



L’origine-des-Faden-quartz-mars-06.jpg
 Description:
 Viewed:  26011 Time(s)

L’origine-des-Faden-quartz-mars-06.jpg



L’origine-des-Faden-quartz-mars-07.jpg
 Description:
 Viewed:  25993 Time(s)

L’origine-des-Faden-quartz-mars-07.jpg



L’origine-des-Faden-quartz-mars-08.jpg
 Description:
 Viewed:  26012 Time(s)

L’origine-des-Faden-quartz-mars-08.jpg



L’origine-des-Faden-quartz-mars-09.jpg
 Description:
 Viewed:  25995 Time(s)

L’origine-des-Faden-quartz-mars-09.jpg



L’origine-des-Faden-quartz-mars-10.jpg
 Description:
 Viewed:  26079 Time(s)

L’origine-des-Faden-quartz-mars-10.jpg



L’origine-des-Faden-quartz-mars-11.jpg
 Description:
 Viewed:  25988 Time(s)

L’origine-des-Faden-quartz-mars-11.jpg



L’origine-des-Faden-quartz-mars-12.jpg
 Description:
 Viewed:  25955 Time(s)

L’origine-des-Faden-quartz-mars-12.jpg



L’origine-des-Faden-quartz-mars-13.jpg
 Description:
 Viewed:  25974 Time(s)

L’origine-des-Faden-quartz-mars-13.jpg



L’origine-des-Faden-quartz-mars-14.jpg
 Description:
 Viewed:  26000 Time(s)

L’origine-des-Faden-quartz-mars-14.jpg


Back to top
Reply to topic Reply with quote
Like
8
   

Pierre Joubert




Joined: 09 Mar 2012
Posts: 1605
Location: Western Cape


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Apr 13, 2017 10:30    Post subject: Re: Faden Quartz Crystals - (26)  

Here are a few very small samples from the Western Cape.


P1230639.JPG
 Mineral: Quartz
 Locality:
Ceres, Warmbokkeveld Valley, Ceres, Valle Warmbokkeveld, Witzenberg, Cape Winelands, Western Cape Province, South Africa
 Dimensions: 17 x 08 x 02 mm
 Description:
 Viewed:  25316 Time(s)

P1230639.JPG



P1230651.JPG
 Mineral: Quartz
 Locality:
Ceres, Warmbokkeveld Valley, Ceres, Valle Warmbokkeveld, Witzenberg, Cape Winelands, Western Cape Province, South Africa
 Dimensions: 15 x 07 x 03 mm
 Description:
 Viewed:  25327 Time(s)

P1230651.JPG



P1230644.JPG
 Mineral: Quartz
 Locality:
Ceres, Warmbokkeveld Valley, Ceres, Valle Warmbokkeveld, Witzenberg, Cape Winelands, Western Cape Province, South Africa
 Dimensions: 15 x 09 x 03 mm
 Description:
 Viewed:  25351 Time(s)

P1230644.JPG



P1230653.JPG
 Mineral: Quartz
 Locality:
Ceres, Warmbokkeveld Valley, Ceres, Valle Warmbokkeveld, Witzenberg, Cape Winelands, Western Cape Province, South Africa
 Dimensions: 10 x 10 x 01 mm
 Description:
 Viewed:  25318 Time(s)

P1230653.JPG



P1230661.JPG
 Mineral: Quartz
 Locality:
Ceres, Warmbokkeveld Valley, Ceres, Valle Warmbokkeveld, Witzenberg, Cape Winelands, Western Cape Province, South Africa
 Dimensions: 12 x 03 x 01 mm
 Description:
 Viewed:  25377 Time(s)

P1230661.JPG



_________________
Pierre Joubert


'The tree of silence bears the fruit of peace. '
Back to top
Reply to topic Reply with quote
Like
7
   

Tobi
Site Admin



Joined: 07 Apr 2009
Posts: 4087
Location: Germany


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Apr 13, 2017 12:16    Post subject: Re: Faden Quartz Crystals - (26)  

Pierre Joubert wrote:
Here are a few very small samples from the Western Cape.
Mineral: Quartz
Locality:Ceres, Warmbokkeveld Valley, Witzenberg, Cape Winelands, Western Cape Province, South Africa
Really nice small faden quartzes, Pierre. Is it the lighting or are they pale yellow - which would make them natural citrine and thus even more interesting and desirable ...?
Back to top
Reply to topic Reply with quote
Like
   
Display posts from previous:   
   Index -> Featured Columns of FMF   All times are GMT - 5 Hours
Page 2 of 4
  Goto page Previous  1, 2, 3, 4  Next  

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


All pictures, text, design © Forum FMF 2006-2024


Powered by FMF