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 3.CB.40
Crystal system Monoclinic
Prismatic class
Identification
Colour Colourless, white, pale lilac; brownish or reddish tinted due to staining; colourless in transmitted light.
Crystal symmetry Monoclinic
H-M symbol: (2/m)
Space group: P21/b
Cleavage Perfect
On {001}; {110} distinct.
Fracture Irregular/ uneven
Tenacity Brittle
Mohs scale hardness 2
Lustre 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]