Thomsenolite

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Thomsenolite
Thomsenolite and Ralstonite - Ivittuut, Arsuk Firth, Kitaa. West Greenland.jpg
Thomsenolite (obelisks) and some pseudocubic ralstonite (picture center)
General
Category Halide minerals
Formula
(repeating unit)
NaCaAlF6·H2O
Strunz classification 03.CB.40
Identification
Color Colourless, white, pale lilac; brownish or reddish tinted due to staining; colourless in transmitted light.
Crystal system Monoclinic
Cleavage Perfect
On {001}; {110} distinct.
Fracture Irregular/ uneven
Tenacity Brittle
Mohs scale hardness 2
Luster Vitreous, pearly
Streak White
Diaphaneity Transparent, translucent
Density 2.981 g/cm3

Thomsenolite is a mineral with formula: NaCaAlF6·H2O. It is an alteration product of cryolite.[1]

It was discovered in 1868 in Ivigtut, Greenland and named for Hans Peter Jorgen Julius Thomsen (1826–1909).[2]

References[edit]