Tenacity
-
-
Solubility
insoluble in water
-
Durability
-
-
Specific Gravity
3.62-3.872.58-2.74
1
7.18
👆🏻
Fracture
Conchoidal
ConchoidalWalter Schumann, Splintery
Cleavage
None
{100} Distinct, {110} Distinct
Mohs Hardness
7-7.55.5-6
2
10
👆🏻
Chemical Composition
Mg 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Na 4Al 3Si 9O 24Cl to Ca 4Al 6Si 6O 24(CO 3,SO 4)Walter Schumann , Gemstones of the world (2001) More from other references