Tenacity
Brittle
Brittle
Solubility
Soluble
-
Durability
-
-
Specific Gravity
2.782.77
1
7.18
👆🏻
Fracture
Conchoidal
Uneven
Cleavage
Perfect on {10 1 }; parting on {010}
Perfect [001] good [010] poor [110]
Mohs Hardness
3.56-6.5
2
10
👆🏻
Chemical Composition
K2Ca2Mg(SO4)4·2H2O
CaAl 2Si 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)