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Jason
Joined: 31 Dec 2008
Posts: 254
Location: atlanta
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 Posted: Jun 13, 2009 04:43 Post subject: Re: Matt's Minerals |
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| nice pics Matt.
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Matt_Zukowski
Site Admin
Joined: 10 Apr 2009
Posts: 737
Location: Alaska
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| Posted: Jun 13, 2009 04:54 Post subject: Re: Matt's Minerals |
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more again
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| Rutile Graves Mtn, GA 5.3 cm |
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| Large rutile xtal without matrix. The red you see in the pictures is from light entering the xtal and bouncing back. |
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| Kunzite Urucum Mine, Minas Gerais 10.7 cm |
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| This complete, etched xtal has both kunzite and hiddenite areas within. Note the triangular etch features. |
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John S. White
Site Admin
Joined: 04 Sep 2006
Posts: 1298
Location: Stewartstown, Pennsylvania, USA
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| Posted: Jun 13, 2009 05:31 Post subject: Re: Matt's Minerals |
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Matt:
The morphology of the pyrite from the Nanisivik mine was well described by Bob Gait, et al. in the Mineralogical Record, vol. 21, p.515, 1990.
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John S. White
aka Rondinaire |
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GneissWare
Joined: 07 Mar 2008
Posts: 1287
Location: California
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| Posted: Jun 13, 2009 14:02 Post subject: Re: Matt's Minerals |
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Matt,
You have good taste in minerals, and good tasting Belgian ale.
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Matt_Zukowski
Site Admin
Joined: 10 Apr 2009
Posts: 737
Location: Alaska
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| Posted: Jun 13, 2009 15:42 Post subject: Re: Matt's Minerals |
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John - excellent article. What do you think, are the faces on the corners trapezohedral and the faces along the edges pyritohedral?
Also, the tortured specimen appears to be similar to figures 32, 33, and 38 (epitaxial pyrite on pyritized marcasite), with maybe some features like figure 36 (iron cross twin). What do you think?
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Matt_Zukowski
Site Admin
Joined: 10 Apr 2009
Posts: 737
Location: Alaska
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| Posted: Jun 13, 2009 15:58 Post subject: Re: Matt's Minerals |
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| Thanks Gneiss
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John S. White
Site Admin
Joined: 04 Sep 2006
Posts: 1298
Location: Stewartstown, Pennsylvania, USA
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| Posted: Jun 14, 2009 05:40 Post subject: Re: Matt's Minerals |
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Matt:
There seems no doubt that the corners are trapezohedral, but I am unwilling to speculate on the other forms from the photos.
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John S. White
aka Rondinaire |
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Matt_Zukowski
Site Admin
Joined: 10 Apr 2009
Posts: 737
Location: Alaska
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| Posted: Jun 14, 2009 16:47 Post subject: Re: Matt's Minerals |
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I don't have any good way of measuring crystallographic angles, so i guess all i can know for now is that the faces are {1n0} where n is 2 or larger.
Thanks.
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Matt_Zukowski
Site Admin
Joined: 10 Apr 2009
Posts: 737
Location: Alaska
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| Posted: Sep 25, 2009 21:56 Post subject: Re: Matt's Minerals |
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This is a Vanadinite I got from Lavinsky about a month ago. These are from the recent find of big lusterous cogwheel xtals. Lavinsky lists them only as being from "near Mibladen." The specimen is 16.4 x 8.6 x 6.1 cm. Pictures are from Rob, I have yet to photograph it myself.
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Jordi Fabre
Overall coordinator of the Forum
Joined: 07 Aug 2006
Posts: 5025
Location: Barcelona
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| Posted: Sep 26, 2009 05:00 Post subject: Re: Matt's Minerals |
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I believe that this specimen is from the ACF Shaft, Mibladen, Midelt, Morocco.
In January of this year some world class specimens, different from this one, came out from there, blood red color and with Baryte. I believe that they will be visible in the Munich Show.
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Audaces fortuna iuvat |
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Matt_Zukowski
Site Admin
Joined: 10 Apr 2009
Posts: 737
Location: Alaska
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| Posted: Sep 26, 2009 19:49 Post subject: Re: Matt's Minerals |
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| Thanks Jordi. The matrix of this specimen is pink and looks like a felsic volcanic. Is this matrix common or possible for ACF vanadinites?
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Jordi Fabre
Overall coordinator of the Forum
Joined: 07 Aug 2006
Posts: 5025
Location: Barcelona
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| Posted: Sep 27, 2009 17:02 Post subject: Re: Matt's Minerals |
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| The matrix for the Mibladen's Vanadinite is or Baryte or a kind of compacted clay.
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Matt_Zukowski
Site Admin
Joined: 10 Apr 2009
Posts: 737
Location: Alaska
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| Posted: May 26, 2010 19:43 Post subject: Re: Matt's Minerals |
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I was experimenting today trying to show clarity in an elmwood calcite. Putting the specimen on a piece of white paper with simple black text seemed to work ok. This composition also shows the glassy luster as reflections of the text.
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| Front - piece is 14.4 cm wide, 8.2 cm tall, and 4.4 cm thick. |
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Matt_Zukowski
Site Admin
Joined: 10 Apr 2009
Posts: 737
Location: Alaska
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| Posted: May 26, 2010 20:16 Post subject: Re: Matt's Minerals |
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The first picture had too much light from the left so i retook it and moved that light.
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