Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.25-3.453.05-3.08
1
7.18
👆🏻
Fracture
Conchoidal, Uneven
Subconchoidal, Uneven, Conchoidal
Cleavage
Good on {110}
Poor on {100}
Mohs Hardness
6.55
2
10
👆🏻
Chemical Composition
Mg 3Al 6(Si,Al,B) 5O 21(OH)Walter Schumann , Gemstones of the world (2001) More from other references
Mn2+ Al(PO 4)(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)