Thomsenolite
(repeating unit)NaCaAlF6·H2O IMA symbol Tse[1] Strunz classification 3.CB.40 Crystal system Monoclinic Crystal class Prismatic (2/m)
(same H-M symbol) Space group P21/b Identification Color Colourless, white, pale lilac; brownish or reddish tinted due to staining; colourless in transmitted light. 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
(same H-M symbol)
On {001}; {110} distinct.
Thomsenolite is a mineral with formula: NaCaAlF6·H2O. It is an alteration product of cryolite.[2]
It was discovered in 1868 in Ivigtut, Greenland and named for Hans Peter Jorgen Julius Thomsen (1826–1909).[3]
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