Tenacity
Brittle
-
Solubility
Soluble
-
Durability
-
-
Specific Gravity
2.753.05-3.08
1
7.18
👆🏻
Fracture
Uneven, Conchoidal
Subconchoidal, Uneven, Conchoidal
Cleavage
Imperfect on {110}
Poor on {100}
Mohs Hardness
5.55
2
10
👆🏻
Chemical Composition
(Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.
Mn2+ Al(PO 4)(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)