Thomsenolite
Mineral NaCaAlF6·H2O
About it
Colourless prisms with a perfect cleavage, formed from altered cryolite and often with pachnolite. Known from Ivittuut, Greenland; named for Julius Thomsen.
- Type
- Mineral
- Group
- Halide
- Formula
- NaCaAlF6·H2O
- Hardness (Mohs)
- 2
- Specific gravity
- 2.9–3
- Streak
- white
- Lustre
- vitreous (glassy)
- Crystal system
- Monoclinic
- Colours
- colourless, white
- Transparency
- transparent, translucent
- Cleavage and fracture
- perfect basal
Typical values: real specimens vary. For more, see mindat.org.