Levyne
Mineral (Ca,Na2,K2)Al2Si4O12·6H2O
Also called Levyne-Ca, Levyne-Na, and Levynite
About it
Thin six-sided plates, often with fibrous overgrowths of erionite or offretite, in basalt cavities; the Faroe Islands, Iceland, and Northern Ireland are well known.
- Type
- Mineral
- Group
- Silicate (tectosilicate), zeolite group
- Formula
- (Ca,Na2,K2)Al2Si4O12·6H2O
- Hardness (Mohs)
- 4–4.5
- Specific gravity
- 2.09–2.16
- Streak
- white
- Lustre
- vitreous (glassy)
- Crystal system
- Trigonal
- Colours
- colourless, white, grey, yellowish, reddish
- Transparency
- transparent, translucent
- Cleavage and fracture
- indistinct rhombohedral
Typical values: real specimens vary. For more, see mindat.org.