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Mottramite : PbCu(VO4)(OH)

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Copyright © Eugene & Sharon Cisneros
 
 
 
 
minID: R0J-4HL

Mottramite : PbCu(VO4)(OH)

Copyright © Eugene & Sharon Cisneros  - This image is copyrighted. Unauthorized reproduction prohibited.
Dimensions: 2.5 cm x 2.5 cm x 2.5 cm

Divergent group of many fine, prismatic, olive brown Mottramite crystals without matrix. Superb example of the species.
Personal collection of Sharon Cisneros.

This photo has been shown 86 times
Photo added:19th Aug 2021
Dimensions:3236x3263px (10.56 megapixels)
Camera:CANON EOS 7D

Data Identifiers

Mindat Photo ID:1160614 📋 (quote this with any query about this photo)
Long-form Identifier:mindat:1:4:1160614:4 📋
GUID:6b0a245e-7eb6-471e-8451-74344b411605 📋
Specimen MinIDR0J-4HL (note: this is not unique to this photo, it is unique to the specimen)

Discuss this Photo

PhotosDoubtful Mottramite

21st Jan 2024 22:15 UTCMax Merlo

This specimen looks more like a copper-rich descloizite, such as these examples:


identified as mottramite I would say is too unusual.


22nd Jan 2024 02:46 UTCHerwig Pelckmans

I agree.
If these are mottramite crystals, they would be extremely large and make this specimen the best in the world for the species.
A tempting idea, but chances are much more likely that this is a copper-rich descloizite, as suggested by Max.
I have sent a message to Gene and Sharon to let them know about this thread.

25th Jan 2024 12:20 UTCHerwig Pelckmans

Update:
Gene & Sharon acquired this specimen in 1979 from a dealer who is no longer among us.

They are asking if anyone knows of an easy way to ID this (and distinguish between the mottramite and the descloizite) ... suggestions are welcome!

25th Jan 2024 13:09 UTCPaul De Bondt Manager

The problem is that mottramite and descloizite forms a serie and to be sure, one need an analysis to distingwish them.
I have green and black mottramites from Tsumeb and will let some analysed because I'm almost sure that the green ones are indeed mottramite and the black ones rather descloizite or even copper-rich descloizite as Max suggest.

Keep safe.

25th Jan 2024 13:27 UTCFranz Bernhard Expert

You can expect heavy chemical zoning in such specimens, so having both species in this specimen is quite a possibility.

25th Jan 2024 16:37 UTCTony Nikischer 🌟 Manager

Although color is unreliable, most of the analytical work we have done on mottramite specimens suggests the darker material (ie nearly black) is cuprian descloizite.
 
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