Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.05-3.082.54-2.78
1
7.18
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Fracture
Subconchoidal, Uneven, Conchoidal
Conchoidal
Cleavage
Poor on {100}
Good in three directions
Mohs Hardness
55-6
2
10
👆🏻
Chemical Composition
Mn2+ Al(PO 4)(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
K(Ca,Na) 2Si 4O 10(OH,F) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references