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Borocookeite, Lepidolite


Borocookeite : Li1+3xAl4-x[(BSi3)O10](OH)8 [0.00 <= x <=0.33], Lepidolite : K(Li,Al)3(Si,Al)4O10(F,OH)2

Photo Copyright © Jeffrey G. Weissman, courtesy Photographic Guide to Mineral Species  - Creative Commons Non-Commercial No Derivatives Licence - Some Rights Reserved
Locality: Malkhan pegmatite field (Malchan), Krasny Chikoy, Chitinskaya Oblast', Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia
Flaky crystalline coatings of borocookeite, on "lepidolite" crystals. Specimen courtesy of Excalibur Mineral Company. The "lepidolite" crystal in the lower left is about 0.2 cm diameter.

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