Tenacity
-
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
3.05-3.082.75
1
7.18
👆🏻
Fracture
Subconchoidal, Uneven, Conchoidal
Uneven, Conchoidal
Cleavage
Poor on {100}
Imperfect on {110}
Mohs Hardness
55.5
2
10
👆🏻
Chemical Composition
Mn2+ Al(PO 4)(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
(Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.