Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.30-2.50
2.80-3.0
Fracture
Uneven, UnevenArthur Thomas, Gemstones (2009)
Not Available
Cleavage
Perfect on (001)
{110} Good
Mohs Hardness
4.5-5
3
Chemical Composition
KCa 4Si 8O 20(F,OH) · 8H 2OUlrich Henn and Claudio C.
NaFeS2•2(H2O)
