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Bertrandite - Kara-Oba W deposit, Betpakdala Desert, Karagandy Province, Kazakhstan
(#:MINS7757)
Cluster with rich coverage of pearl white Bertrandite xls, spread over smoky Quartz xls.The specimen is in pretty good shape. These pieces appeared on the market around ten to twenty years ago and seemed quite common then, but they actually were old pieces that became available after the end of the former USSR. They are now absolutely hard to find, expecially with this quality.
Formula :
Be
4
[(OH)
2
/Si
2
O_7_]
System:
orthorhombic
Hardness:
6-7
Rarity:
not common
Strunz id:VIII/C.7-10 - SILICATES
Name origin:
For Emile Bertrand (1844-1909) French mineralogist
Specimen weight:36 gr.
Crystal size:up to 5 mm long
Overall size: 48mm x 35 mm x 30 mm
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