Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.355-3.4333.05-3.08
1
7.18
👆🏻
Fracture
Uneven
Subconchoidal, Uneven, Conchoidal
Cleavage
{???} Good, {???} Good
Poor on {100}
Mohs Hardness
-99995
2
10
👆🏻
Chemical Composition
(Ca,Mn2+ ,Fe2+ ) 3Al 2BSi 4O 15(OH)Anthony et al , Handbook of mineralogy (2001)
Mn2+ Al(PO 4)(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)