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Volkovskite

#43710

Volkovskite

#43710
Availability
Sold
Size
6 x 3 x 2.5 cm - Sm Cabinet 
Formula
KCa4[B5O8(OH)]4[B(OH)3]2Cl·4H2O (RRUFF)
Locality
Boulby Potash mine, Loftus, Cleveland, England

I picked up three of these in Tucson, and these were cream of the crop. No where does it occur better than this locality. Volkovskite is a very rare borate typically found in salt domes or potash deposits. Undoubtedly it is the best locality. The specimen is basically a platy pink-orange mass with crystals to 3cm packed in a nice colliform mass. Formerly Tim Sherburn collection.

Volkovskite

Formula
KCa4[B5O8(OH)]4[B(OH)3]2Cl·4H2
Crystal System
Triclinic 
Cleavage
Perfect, Good, None 
Luster
Vitreous (Glassy) 
Color
colorless, light orange, pink 
Streak
white 
Class
Triclinic - Pedial 
Fracture
Brittle - Splintery 
Hardness
2.5 

Data courtesy of Webmineral.

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