Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.58-2.743.82-4.00
1
7.18
👆🏻
Fracture
ConchoidalWalter Schumann, Splintery
-
Cleavage
{100} Distinct, {110} Distinct
{???} Indistinct
Mohs Hardness
5.5-65.5
2
10
👆🏻
Chemical Composition
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
Mn2+9(SiO 4) 4(OH,F) 2Anthony et al , Handbook of mineralogy (2001)