Chabazite
Mineral (Ca,Na2,K2)Al2Si4O12·6H2O
Also called Chabazite-Ca, Chabazite-Na, Phacolite, Acadialite, and Herschelite
About it
Nearly cube-shaped rhombohedra, often twinned, in basalt cavities; looks like calcite but doesn't fizz in acid. Nova Scotia (red acadialite), Oregon, and Germany.
- Type
- Mineral
- Group
- Silicate (tectosilicate), zeolite group
- Formula
- (Ca,Na2,K2)Al2Si4O12·6H2O
- Hardness (Mohs)
- 4–5
- Specific gravity
- 2.05–2.2
- Streak
- white
- Lustre
- vitreous (glassy)
- Crystal system
- Trigonal
- Colours
- white, colourless, pink, peach, yellow, red
- Transparency
- transparent, translucent
- Cleavage and fracture
- indistinct rhombohedral
Typical values: real specimens vary. For more, see mindat.org.