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Oddities from Brandberg, Namibia
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Pierre Joubert




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PostPosted: Jul 31, 2015 03:06    Post subject: Re: Oddities from Brandberg, Namibia  

Mike Wood wrote:
Beautiful amythest crystals Pierre, shame about the glue. I must say your photo's are extremely clear and well composed. Thanks for taking the trouble to photograph and post these glued specimens.

Best regards,
Mike


Hi Mike. Thank you for the compliment. As you know, my photography method is very simple (straight forward) and with no expensive equipment.
Why some people choose the route of deception rather than hard work will always intrigue me. I am sure this chap could have used his artistic skills to a better use :-)

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PostPosted: Mar 29, 2017 07:54    Post subject: Re: Oddities from Brandberg, Namibia  

It appears that my guess for this specimen (P1290780.JPG) was correct, Chrysocolla. Please have a look at this similar specimen https://www.mindat.org/photo-201797.html
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PostPosted: May 31, 2017 08:36    Post subject: Re: Oddities from Brandberg, Namibia  

Here is a double terminated quartz specimen with an unknown mineral on. We have a few specimens with the same mineral on (not very common), but not nearly as nice as this one. Can anyone help identify this mineral on the quartz?


P1270415.JPG
 Mineral: Quartz and?
 Locality:
Goboboseb Mountains, Brandberg area, Erongo Region, Namibia
 Dimensions: 82 x 38 x 24 mm
 Description:
 Viewed:  1417 Time(s)

P1270415.JPG



P1270416.JPG
 Mineral: Quartz and?
 Locality:
Goboboseb Mountains, Brandberg area, Erongo Region, Namibia
 Dimensions: 82 x 38 x 24 mm
 Description:
 Viewed:  1415 Time(s)

P1270416.JPG



P1270418.JPG
 Mineral: Quartz and?
 Locality:
Goboboseb Mountains, Brandberg area, Erongo Region, Namibia
 Dimensions: 82 x 38 x 24 mm
 Description:
 Viewed:  1414 Time(s)

P1270418.JPG



P1270421.JPG
 Mineral: Quartz and?
 Locality:
Goboboseb Mountains, Brandberg area, Erongo Region, Namibia
 Dimensions: 82 x 38 x 24 mm
 Description:
 Viewed:  1413 Time(s)

P1270421.JPG



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Tobi




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PostPosted: May 31, 2017 10:08    Post subject: Re: Oddities from Brandberg, Namibia  

Pierre Joubert wrote:
Here is a double terminated quartz specimen with an unknown mineral on. We have a few specimens with the same mineral on (not very common), but not nearly as nice as this one. Can anyone help identify this mineral on the quartz?
Do you have some further information like hardness or streak? At first sight, it looks to me like calcite ...
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Pierre Joubert




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PostPosted: May 31, 2017 10:47    Post subject: Re: Oddities from Brandberg, Namibia  

Tobi wrote:
Pierre Joubert wrote:
Here is a double terminated quartz specimen with an unknown mineral on. We have a few specimens with the same mineral on (not very common), but not nearly as nice as this one. Can anyone help identify this mineral on the quartz?
Do you have some further information like hardness or streak? At first sight, it looks to me like calcite ...


Hi Tobi. I hope you will understand that I have no intention to tamper with this specimen. I also thought about heavily included calcite.

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PostPosted: Jun 10, 2017 13:24    Post subject: Re: Oddities from Brandberg, Namibia  

Another oddity from Brandberg; calcite with aggregate balls of epidote?Even though I have seen these type of specimens every now and then, I still consider it as an oddity. I am not absolutely sure that the balls are epidote.


P1270895.JPG
 Mineral: Calcite with epidote inclusions?
 Locality:
Brandberg area, Erongo Region, Namibia
 Dimensions: 31 x 24 x 16 mm
 Description:
 Viewed:  1118 Time(s)

P1270895.JPG



P1270899.JPG
 Mineral: Calcite with epidote?
 Locality:
Brandberg area, Erongo Region, Namibia
 Dimensions: Same as above
 Description:
 Viewed:  1120 Time(s)

P1270899.JPG



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PostPosted: Aug 15, 2017 12:22    Post subject: Re: Oddities from Brandberg, Namibia  

Another oddity from Brandberg area. The small dark crystals appear to be epidote. If it is, I have seen similar in calcite and in quartz from this area, but never in this size. I have never seen epidote in this form yet. I will appreciate your input.


P1310205.JPG
 Mineral: Quartz, Prehnite, Calcite and unknown mineral.
 Locality:
Brandberg area, Erongo Region, Namibia
 Dimensions: 61 x 60 x 36 mm
 Description:
Unknown balls of an unknown mineral sits in a geode of quartz, calcite and prehnite.
 Viewed:  728 Time(s)

P1310205.JPG



P1310207.JPG
 Mineral: Unknown
 Locality:
Brandberg area, Erongo Region, Namibia
 Description:
 Viewed:  726 Time(s)

P1310207.JPG



P1310208.JPG
 Mineral: Unknown
 Locality:
Brandberg area, Erongo Region, Namibia
 Description:
 Viewed:  728 Time(s)

P1310208.JPG



P1310213.JPG
 Mineral: Unknown
 Locality:
Brandberg area, Erongo Region, Namibia
 Description:
There are 4 visible balls, up to about 7mm in diameter.
 Viewed:  729 Time(s)

P1310213.JPG



P1310226.JPG
 Mineral: Unknown
 Locality:
Brandberg area, Erongo Region, Namibia
 Description:
 Viewed:  727 Time(s)

P1310226.JPG



P1310215.JPG
 Mineral: Unknown
 Locality:
Brandberg area, Erongo Region, Namibia
 Description:
 Viewed:  725 Time(s)

P1310215.JPG



P1310221.JPG
 Mineral: Unknown
 Locality:
Brandberg area, Erongo Region, Namibia
 Description:
 Viewed:  731 Time(s)

P1310221.JPG



P1310219.JPG
 Mineral: Unknown
 Locality:
Brandberg area, Erongo Region, Namibia
 Dimensions: Dark mineral, about 2 mm wide
 Description:
This broken, small dark crystal, may give an indication as to what it is.
 Viewed:  725 Time(s)

P1310219.JPG



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vic rzonca




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PostPosted: Aug 15, 2017 13:43    Post subject: Re: Oddities from Brandberg, Namibia  

My only input is anecdotal, Pierre. I have often found that association in the trap deposits where I collect. Quartz, prehnite and epidote. The radiating structure is interesting.
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PostPosted: Aug 16, 2017 10:12    Post subject: Re: Oddities from Brandberg, Namibia  

Ras Greeff says that he thinks it is pumpellyte Ca2MgAl2(SiO4)(Si2O7)(OH)2•(H2O)
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PostPosted: Aug 16, 2017 10:33    Post subject: Re: Oddities from Brandberg, Namibia  

Pierre Joubert wrote:
Ras Greeff says that he thinks it is pumpellyte Ca2MgAl2(SiO4)(Si2O7)(OH)2•(H2O)

Why not, but it could be also some species from the Chlorite Group. Hard to say without analysis...
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PostPosted: Aug 16, 2017 10:48    Post subject: Re: Oddities from Brandberg, Namibia  

Jordi Fabre wrote:
Pierre Joubert wrote:
Ras Greeff says that he thinks it is pumpellyte Ca2MgAl2(SiO4)(Si2O7)(OH)2•(H2O)

Why not, but it could be also some species from the Chlorite Group. Hard to say without analysis...


Thank you Jordi!

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