Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.55-2.653.05-3.08
1
7.18
👆🏻
Fracture
Conchoidal
Subconchoidal, Uneven, Conchoidal
Cleavage
Perfect {10 1 0}
Poor on {100}
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)
Mn2+ Al(PO 4)(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)