Rammelsbergite : NiAs2, Gersdorffite : NiAsS, Dolomite : CaMg(CO3)2, Calcite : CaCO3

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Copyright © AC

Rammelsbergite : NiAs2, Gersdorffite : NiAsS, Dolomite : CaMg(CO3)2, Calcite : CaCO3

Copyright © AC  - This image is copyrighted. Unauthorized reproduction prohibited.

Bought this specimen as korynite; XRD showed much rammelsbergite and dolomite, minor gersdorffite and calcite; specimen size 5,5 x 3,8 cm; Chris Auer photo and collection, bought in 1993

For discussion on correct locality info, see https://www.mindat.org/mesg-106-436798.html.

This photo has been shown 849 times
Photo added:27th Jan 2008
Dimensions:1600x1200px (1.92 megapixels)
Date/Time of Photo:27th Jan 2008 09:38:34
Exposure time:1/160s
Focal Length:6mm
ISO speed:80
View Christian Auer's Photos View Rammelsbergite Gallery

Discuss this Photo

PhotosRammelsbergite - Greinig (Greining) adit, Minachberg, Olsa, Friesach, Friesach - Hüttenberg area, Carinthia, Austria

4th May 2018 06:14 BSTChristian Auer Expert

I bought this very expensive specimen a long time ago and Uwe Kolitsch was so kind to XRD it also a long time ago.

The matrix is dolomite and calcite, the ore minerals rammelsbergite and gersdorffite.

The last weeks I analysed myself a lot of classic specimen from this old mine, all labelled as korynite (a report will be published next year).

Till now I didn`t find any dolomite nor any rammelsbergite - which doesn`t mean a lot as that material is over 100 years old and so material quite common then can be extremely rare nowadays.

I am just curious and suspicious if this specimen could also be from another Bi-Co-Ni formation (Saxony or Czech Republic)?

4th May 2018 13:09 BSTReiner Mielke Expert

Hello Christian,

I am not sure what your concern is. You said Uwe indentified dolomite and rammelsbergite in your sample from the Greinig adit so are you now questioning if it is from there? Here in Cobalt, Ontario mineralization can be of very limited extent. For example 40 years ago I found a 1kg piece of massive maucherite with pyrargyrite and have been back at least 10 times to look for more but have never found any again. It may be that your piece is also a one of a kind from mineralization of very limited extent.

4th May 2018 13:20 BSTChristian Auer Expert

Well within several ID`s I`ve never found dolomite or rammelsbergite.

On the other side there are at least 3 adits named together in literature as Greinig adit. Non of them is accessible anymore just more or less overgrown dumps. I just wonder why I never found something trivial as dolomite?

If someone from Saxony jumps in and says thats exactly what I found in Schlema (for example) my doubts would increase.

But you never could say for sure ...

11th May 2018 20:44 BSTUwe Kolitsch Manager

Comment added to caption.
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