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Thomsenolite and Ralstonite - Ivittuut, Arsuk Firth, Kitaa. West Greenland.jpg

Thomsenolite (obelisks) and some pseudocubic ralstonite (picture center)
Category Halide minerals
(repeating unit)
Strunz classification 3.CB.40
Crystal system Monoclinic
Crystal class Prismatic (2/m)
(same H-M symbol)
Space group P21/b
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

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

Cryolite perovskite, halide mineral (as opposed to the chemical compound)

Cryolite (Na3AlF6, sodium hexafluoroaluminate) is an uncommon mineral identified with the once large deposit at Ivigtût on the west coast of Greenland, depleted by 1987.

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

Greenland autonomous country within the Kingdom of Denmark

Greenland is an autonomous constituent country of the Kingdom of Denmark between the Arctic and Atlantic oceans, east of the Canadian Arctic Archipelago. Though physiographically a part of the continent of North America, Greenland has been politically and culturally associated with Europe for more than a millennium. The majority of its residents are Inuit, whose ancestors began migrating from the Canadian mainland in the 13th century, gradually settling across the island.