Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.58-2.633.05-3.08
1
7.18
👆🏻
Fracture
Conchoidal
Subconchoidal, Uneven, Conchoidal
Cleavage
None
Poor on {100}
Mohs Hardness
6.5-75
2
10
👆🏻
Chemical Composition
SiO 2Ulrich Henn and Claudio C.
Mn2+ Al(PO 4)(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)