Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.55-2.653.76-3.77
1
7.18
👆🏻
Fracture
Conchoidal
-
Cleavage
Perfect {10 1 0}
{110} Perfect, {110} Perfect
Mohs Hardness
5.5-65-6
2
10
👆🏻
Chemical Composition
(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)
(Fe,Mn) 7Si 7O 21Ulrich Henn and Claudio C.