Thomsenolite

From Wikipedia, the free encyclopedia
Thomsenolite
Thomsenolite and Ralstonite - Ivittuut, Arsuk Firth, Kitaa. West Greenland.jpg
Thomsenolite (obelisks) and some pseudocubic (picture center)
General
CategoryHalide minerals
Formula
(repeating unit)
NaCaAlF6·H2O
Strunz classification3.CB.40
Crystal systemMonoclinic
Crystal classPrismatic (2/m)
(same H-M symbol)
Space groupP21/b
Identification
ColorColourless, white, pale lilac; brownish or reddish tinted due to staining; colourless in transmitted light.
CleavagePerfect
On {001}; {110} distinct.
FractureIrregular/ uneven
TenacityBrittle
Mohs scale hardness2
LustreVitreous, pearly
StreakWhite
DiaphaneityTransparent, translucent
Density2.981 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[]


Retrieved from ""