Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.05-3.081.98-2.50
1
7.18
👆🏻
Fracture
Subconchoidal, Uneven, Conchoidal
ConchoidalWalter Schumann
Cleavage
Poor on {100}
None
Mohs Hardness
55.5-6.5
2
10
👆🏻
Chemical Composition
Mn2+ Al(PO 4)(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)