1 Physical Properties
1.1 Tenacity
Not Available
Not Available
1.2 Solubility
Not Available
Not Available
1.6 Durability
1.7 Specific Gravity
1.8 Fracture
Conchoidal, Brittle, Conchoidal
Uneven, Conchoidal, UnevenWalter Schumann, Gemstones of the world (2001)
1.9 Cleavage
Good on [110] and on [001]
Perfect {010}, imperfect {100}
1.10 Mohs Hardness
1.11 Chemical Composition
[ ]Na2(Mg3Al2)Si8O22(OH)2
Ca2Al3(SiO4)3(OH)