Tenacity
-
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
2.55-2.653.30-3.50
1
7.18
👆🏻
Fracture
Conchoidal
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
Perfect {10 1 0}
Perfect on {110}, poor on {101}, {001} rare
Mohs Hardness
5.5-65
2
10
👆🏻
Chemical Composition
(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)
Zn 4Si 2O 7(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references