Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.68-2.72
3-3.15
Fracture
ConchoidalWalter Schumann, Gemstones of the world (2001), ConchoidalWalter Schumann, Gemstones of the world (2001)
Conchoidal, Brittle, Conchoidal
Cleavage
Not Available
Good on [110] and on [001]
Mohs Hardness
7.5-8
6.0-6.5
Chemical Composition
Not Available
[ ]Na2(Mg3Al2)Si8O22(OH)2
