Thomsenolite
| 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 |
| Identification | |
| Colour | Colourless, white, pale lilac; brownish or reddish tinted due to staining; colourless in transmitted light. |
| Crystal symmetry |
Monoclinic - prismatic 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
This article is issued from Wikipedia - version of the Wednesday, April 20, 2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.