Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
1.98-2.503.05-3.08
1
7.18
👆🏻
Fracture
ConchoidalWalter Schumann
Subconchoidal, Uneven, Conchoidal
Cleavage
None
Poor on {100}
Mohs Hardness
5.5-6.55
2
10
👆🏻
Chemical Composition
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
Mn2+ Al(PO 4)(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)