Tenacity
Brittle
Brittle
Solubility
Slowly dissolves in water
Soluble
Durability
-
-
Specific Gravity
-99993.30-3.50
1
7.18
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Fracture
Conchoidal
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
None
Perfect on {110}, poor on {101}, {001} rare
Mohs Hardness
3.5-45
2
10
👆🏻
Chemical Composition
K2Mg2(SO4)3
Zn 4Si 2O 7(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references