Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.05-3.083.03-3.18
1
7.18
👆🏻
Fracture
Subconchoidal, Uneven, Conchoidal
Uneven, Irregular, Conchoidal
Cleavage
Poor on {100}
{???} Indistinct
Mohs Hardness
57-7.5
2
10
👆🏻
Chemical Composition
Mn2+ Al(PO 4)(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)