Thomsenolite
Thomsenolite is a mineral with formula: NaCaAlF6·H2O. It is an alteration product of cryolite.[1]
| Thomsenolite | |
|---|---|
 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 |
| 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 |
It was discovered in 1868 in Ivigtut, Greenland and named for Hans Peter Jorgen Julius Thomsen (1826–1909).[2]
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