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Miargyrite : AgSbS2

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Copyright © Eugene & Sharon Cisneros
 
 
 
 
minID: VNM-76C

Miargyrite : AgSbS2

Copyright © Eugene & Sharon Cisneros  - This image is copyrighted. Unauthorized reproduction prohibited.
Dimensions: 5.8 cm x 3.5 cm x 2.8 cm

Exceptionally well crystallized, dark metallic red-gray-black Miargyrite crystals have formed several stalactite-like rounded aggregates, standing up on massive Miargyrite matrix. Some of the terminations of the crystals show a slight, dark metallic blue-black iridescence.
From the Gold, Silver, and Silver-bearing minerals collection of Eugene & Sharon Cisneros.

This Photo was Mindat.org Photo of the Day - 10th Jan 2022

This photo has been shown 618 times
Photo added:26th Nov 2021
Dimensions:3631x2504px (9.09 megapixels)

Data Identifiers

Mindat Photo ID:1181343 📋 (quote this with any query about this photo)
Long-form Identifier:mindat:1:4:1181343:4 📋
GUID:85ae8ffc-380d-4084-a999-30100e8db6aa 📋
Specimen MinIDVNM-76C (note: this is not unique to this photo, it is unique to the specimen)

Discuss this Photo

PhotosBaumstarkite?

10th Jan 2022 01:51 UTCAlfredo Petrov Manager

Might be baumstarkite rather than miargyrite? A very nice specimen, whatever it is.

10th Jan 2022 08:25 UTCKnut Eldjarn 🌟 Manager

Beautiful specimen - looks very much like a specimen in my collection that I purchased from Mineralogical Research Company 40 years ago. It is nice to know that Eugene and Sharon kept one of the best for their own collection...
As for the correct identity, I am a bit bewildered. I know that both miargyrite and baumstarkite have been identified from the locality but have seen no publication/documentation supporting the platy crystals as on this specimen being baumstarkite. In Mindat pictures of similar specimens can be found listed under both dimorphs. Just one of the descriptions include analytical claims ( see: https://www.mindat.org/photo-814682.html ). With reference to XRD this similar looking specimen is said to be miargyrite...

10th Jan 2022 10:26 UTCKeith Compton 🌟 Manager

Message has been sent 

10th Jan 2022 11:58 UTCCarsten Slotta 🌟 Expert

The ID is correct from what I can tell. Miargyrite and baumstarkite can be distinguished easily by their fracture / cleavage. Baumstarkite shows perfect cleavage, Miargyrite doesn't and breaks conchoidal.

Baumstarkite crystals are much rarer than the heavily striated miargyrite crystals, but they can occur together. Analyzed examples can be seen here:


Here a perfect example of miargyrite from the same locality:

This picture shows typical miargyrite crystals and not as stated baumstarkite:





10th Jan 2022 13:08 UTCGianfranco Ciccolini 🌟

05711810017057045194004.jpg
Baumstarkite
 
My mistake was not having specified in the description what miargyrite refers to and what baumstarkite refers to. In my opinion the black crystals with the typical "V" signs are referable to miargyrite, while the crystals at the bottom, which act as a matrix, refer to the baumstarkite especially on the right, where the cleavage is noted. In any case, I have corrected by accepting your kind and interesting information. Thank you all.  

10th Jan 2022 15:38 UTCFrank Keutsch Expert

I can't see any baumstarkite on this specimen that I am certain of. This is true for a few of the photos here on mindat. If the matrix of a specimen has baumstarkite it is easy to distinguish as baumstarkite has perfect cleavage (and not a red streak) nearly like tellurobismuthite (color is more black than tellurobismutite for sure and I just mean that as an example of the kind of cleavage). The cleavage really is very distinct and distinguishes it from both miargyrite and sangenaroite.
 
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