Zharchikhite

Zharchikhite is a mineral, a hydroxy fluoride of aluminium; formula AlF(OH)2. It forms colourless, transparent crystals. Discovered in 1968, it is named after its original locality, the Zharchinskoya Deposit, Eastern Russia.
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General Information:
 Chemical Formula:
AlF(OH)2
 Composition:
(Molecular Weight = 79.99 gm)
Aluminum 33.73 % Al
Hydrogen 2.52 % H 
Oxygen 40.00 % O 
Fluorine 23.75 % F 
 Empirical Formula:
AlF(OH)2
 IMA Status:
Approved IMA
Physical Properties:
 Cleavage:
[???] Perfect
 Color:
colorless.
 Density:
2.81
 Diaphaniety:
Transparent
 Hardness:
4.5 - Between Fluorite and Apatite
 Luster:
Vitreous (Glassy)
 Streak:
white
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