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Roger Warin
Joined: 23 Jan 2013
Posts: 1180
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Posted: Feb 03, 2013 15:08 Post subject: Legrandite |
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Hi,
Before returning to more traditional minerals, here is a very rare zinc arsenate. It is from Mapimi, but I do not distinguish between the local normal site Ojuela Mine and the topotype Mine "Flor de Peña", Lampazos, Nuevo Leon.
Paragenesis can help. The secondary mineral seems to be Adamite, I think.
I don’t know that small red spherules. The matrix is limonite.
Thank you for helping me.
Roger.
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Legrandite Mapimi, Durango, Mexico with adamite |
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Adamite Mapimi, Durango, Mexico with Legrandite |
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Jordi Fabre
Overall coordinator of the Forum
Joined: 07 Aug 2006
Posts: 4906
Location: Barcelona
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Posted: Feb 22, 2013 11:05 Post subject: Re: Legrandite |
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It looks to me as Carminite but this is just a personal impression without any scientific confirmation.
Peter Megaw is a great expert of this mine, hopefully he can see this post...
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Peter Megaw
Site Admin
Joined: 13 Jan 2007
Posts: 963
Location: Tucson, Arizona
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Posted: Feb 22, 2013 11:54 Post subject: Re: Legrandite |
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The elongate chisel-tipped habit of the legrandite is typical for Ojuela as is the association with adamite. I am not aware of ever seeing adamite on a Flor de Peña piece. Both commonly have rice-grain smithsonite associated.
Carminite is known from both localities...like Jordi, I think that's what's on your piece, but it would take analysis to be sure.
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Legrandite Flor de Peña, Lampazos, Nuevo León, Mexico 10 cm typical truncated crystals for Flor de Peña |
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8303 Time(s) |
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_________________ Siempre Adelante! |
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Roger Warin
Joined: 23 Jan 2013
Posts: 1180
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Posted: Feb 22, 2013 12:23 Post subject: Re: Legrandite |
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Hello,
Many thanks for these pertinent words.
Here is a drawing with indices corresponding to the position of the crystal in the photo.
Roger.
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