Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.05-3.082.50-2.80
1
7.18
👆🏻
Fracture
Subconchoidal, Uneven, Conchoidal
-
Cleavage
Poor on {100}
Perfect
Mohs Hardness
55-6.5
2
10
👆🏻
Chemical Composition
Mn2+ Al(PO 4)(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Na 4(Al,Si) 12O 24Cl to Ca 4(Si,Al) 12O 24(CO 3,SO 4)Arthur Thomas , Gemstones (2009)