Tenacity
-
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
3.0-3.53.30-3.50
1
7.18
👆🏻
Fracture
Uneven
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
Perfect
Perfect on {110}, poor on {101}, {001} rare
Mohs Hardness
5-65
2
10
👆🏻
Chemical Composition
Na(CaNa)(Mg,Fe++)5(Si8O22)(OH)2
Zn 4Si 2O 7(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references