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thehippi
Joined: 25 Apr 2012
Posts: 8
Location: Utah
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 Posted: Apr 25, 2012 19:37 Post subject: Fenster Quartz |
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Just pick up a few of these recently at a show
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thehippi
Joined: 25 Apr 2012
Posts: 8
Location: Utah
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| Posted: Apr 25, 2012 19:40 Post subject: Re: Fenster Quartz |
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Fenster
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Fenster Quartz
Mexico
30 x 20 MM
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Pierre Joubert
Joined: 09 Mar 2012
Posts: 1605
Location: Western Cape
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| Posted: Apr 26, 2012 02:59 Post subject: Re: Fenster Quartz |
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The Photos are a bit unclear. Why do you call the Specimen "fenster' (window) quartz? I see no windows. Best Regards
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Pierre Joubert
'The tree of silence bears the fruit of peace. ' |
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vic rzonca
Joined: 18 Nov 2008
Posts: 820
Location: MA
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| Posted: Apr 26, 2012 06:36 Post subject: Re: Fenster Quartz |
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Here are two images of , what i think is, fenster quartz. Pierre's image seems to have "windows" that don't manifest on the surface of the crystal faces. These do.
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| Quartz from the Little Falls dolomite, in New York state. The crystal is 18x14 cm. Very obvious stepped faces with "windows?" |
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Pierre Joubert
Joined: 09 Mar 2012
Posts: 1605
Location: Western Cape
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| Posted: Apr 26, 2012 06:59 Post subject: Re: Fenster Quartz |
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'Quartz from the Little Falls dolomite, in New York state.' ???
Are you sure this crystal comes from NY State? It looks like a Brandberg specimen.
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Pierre Joubert
'The tree of silence bears the fruit of peace. ' |
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vic rzonca
Joined: 18 Nov 2008
Posts: 820
Location: MA
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| Posted: Apr 26, 2012 07:25 Post subject: Re: Fenster Quartz |
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No mistake, Pierre, collected it myself. It's actually half of a larger crystal. The Little Falls formation runs from Fonda westward to Herkimer Co.. Lots of quartz, some calcit, dolomite, marcasite and some others, in a pretty compact dolostone.
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Pierre Joubert
Joined: 09 Mar 2012
Posts: 1605
Location: Western Cape
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| Posted: Apr 26, 2012 07:44 Post subject: Re: Fenster Quartz |
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Wow! I would have lost a bet if placed one on this specimen! I have seen many Brandberg 'venster' Quartz specimens, and yours looks just like one. May I suggest that you send us more photographs of quartz specimens from this area. I spend a lot of time digging for quartz specimens and when I find time I hope to show some specimens from our area (Western Cape, South Africa) Regards
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Pierre Joubert
'The tree of silence bears the fruit of peace. ' |
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vic rzonca
Joined: 18 Nov 2008
Posts: 820
Location: MA
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| Posted: Apr 26, 2012 07:45 Post subject: Re: Fenster Quartz |
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| I should have said the Thehippi image shows "fenstering"(new word?). It also seems to show a possible bubble inclusion within the "fentering". Take a close look, Thehippi (real name?).
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vic rzonca
Joined: 18 Nov 2008
Posts: 820
Location: MA
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| Posted: Apr 26, 2012 07:58 Post subject: Re: Fenster Quartz |
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| Pierre, perhaps a refresher on the geology of the Bandenburg fenster location?
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Pierre Joubert
Joined: 09 Mar 2012
Posts: 1605
Location: Western Cape
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| Posted: Apr 26, 2012 12:36 Post subject: Re: Fenster Quartz |
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| vic rzonca wrote: | | Pierre, perhaps a refresher on the geology of the Bandenburg fenster location? |
Hi vic rzonca. 'Venster' Quartz is a fairly common occurrence in the Brandberg area; to be more specific, the Karoo Basalts of the Goboboseb or better known as Tafelkop area. Most of these specimens have clay included. I hope this answers your question. I hope to post a few photos of some 'Venster' Quartz specimens soon.
Regards
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Pierre Joubert
'The tree of silence bears the fruit of peace. ' |
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Riccardo Modanesi
Joined: 07 Nov 2011
Posts: 630
Location: Milano
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| Posted: Apr 27, 2012 04:04 Post subject: Re: Fenster Quartz |
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Hi to everybody!
This time I have a question for all of you: why are we always trying to take adventures by giving those strange (and in many cases "scoop") names to minerals and gemstones? I think it is sufficient to call it "quartz with inclusions", shortly describing the inclusions in particular cases. For example this one may be said "quartz with clay minerals and crystal facets inclusions"! However it remembers me a phantom quartz, the difference is not so big!
Greetings from Italy by Riccardo.
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Hi! I'm a collector of minerals since 1973 and a gemmologist. On Summer I always visit mines and quarries all over Europe looking for minerals! Ok, there is time to tell you much much more! Greetings from Italy by Riccardo. |
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vic rzonca
Joined: 18 Nov 2008
Posts: 820
Location: MA
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| Posted: Apr 27, 2012 06:19 Post subject: Re: Fenster Quartz |
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| Riccardo, I think in this case "fenster" is less a "scoop" than an attempt to be descriptive, in that fenster comes from the noun fenestration, which describes the arrangement of windows in a building. Admittedly, some folks go a little nuts when it comes to naming their "scoop" , like trademarked Azeztulite (massive milky quartz), Aqua Aura Quartz, Aqua Lemuria (?). Would the crystal faces that form this quartz, and the clay that is not surrounded by silica be called an inclusion?
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Pierre Joubert
Joined: 09 Mar 2012
Posts: 1605
Location: Western Cape
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| Posted: Apr 27, 2012 13:53 Post subject: Re: Fenster Quartz |
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| vic rzonca wrote: | | Riccardo, I think in this case "fenster" is less a "scoop" than an attempt to be descriptive, in that fenster comes from the noun fenestration, which describes the arrangement of windows in a building. Admittedly, some folks go a little nuts when it comes to naming their "scoop" , like trademarked Azeztulite (massive milky quartz), Aqua Aura Quartz, Aqua Lemuria (?). Would the crystal faces that form this quartz, and the clay that is not surrounded by silica be called an inclusion? |
Spot on vic. 'Venster' is the Afrikaans name used by the Brandberg miners to describe crystals with window like cavities on the facets. In some cases the clay is captured inside the crystal but in most cases, it has merely filled the open cavities.
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Pierre Joubert
'The tree of silence bears the fruit of peace. ' |
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thehippi
Joined: 25 Apr 2012
Posts: 8
Location: Utah
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| Posted: May 24, 2012 00:35 Post subject: Re: Fenster Quartz |
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pierre, i refer to it as fenster quartz because as i know fenster not only refers to windows, but also as to the internal characteristics of the quartz, sometimes also called skeletal quartz.
Vic real name rob
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Pierre Joubert
Joined: 09 Mar 2012
Posts: 1605
Location: Western Cape
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| Posted: May 24, 2012 05:35 Post subject: Re: Fenster Quartz |
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| thehippi wrote: | pierre, i refer to it as fenster quartz because as i know fenster not only refers to windows, but also as to the internal characteristics of the quartz, sometimes also called skeletal quartz.
Vic real name rob |
Hi Rob. I often wonder where the name 'venster' really came from. Possibly the Damaras in Namibia, who first found and described quartz specimens with window-like cavities. I include 2 specimens from brandberg; not the best examples but examples anyway. Best regards.
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'Venster' quartz
Brandberg, Namibia
60 x 25 x 18 mm
An example of Brandberg 'Venster' quartz |
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Pierre Joubert
'The tree of silence bears the fruit of peace. ' |
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