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Cronstedtite : Fe2+2Fe3+((Si,Fe3+)2O5)(OH)4

Copyright © Rob Lavinsky & irocks.com
 
 
 
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Cronstedtite : Fe2+2Fe3+((Si,Fe3+)2O5)(OH)4

Copyright © Rob Lavinsky & irocks.com  - This image is copyrighted. Unauthorized reproduction prohibited.
Dimensions: 3.5 cm x 2.3 cm x 1.8 cm

3.5 x 2.3 x 1.8 cm. Cronstedtite is a rare iron silicate of the serpentine group. This very rich and showy little specimen is festooned with lustrous, black, trigonal crystals to 3 mm on a 3-dimensional crust of matrix. It is a rare occurrence to have such a rich coverage of cronstedtite, and this specimen displays very well. This is a classic rarity from the famous Herja Mine of Romania.


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Photo added: 17th Mar 2009

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