Zharchikhite

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Zharchikhite
General
Category Halide mineral
Formula
(repeating unit)
AlF(OH)2
Strunz classification 3.AC.05
Crystal system Monoclinic, pseudo-orthorhombic
Identification
Colour Colorless
Crystal habit Elongated prismatic cryatals, massive, drusy coatings
Cleavage Perfect (010)
Tenacity Very brittle
Mohs scale hardness 4.5
Luster Vitreous
Diaphaneity Transparent
Specific gravity 2.81
Optical properties Biaxial (-)
Refractive index nα = 1.532 nβ = 1.552 nγ = 1.567
Birefringence δ = 0.035
2V angle 80° (calculated)
References [1][2]

Zharchikhite is a halide mineral, a hydroxyl 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, which is in Buryatia, Russia.

References[edit]