Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.82-4.002.58-2.74
1
7.18
👆🏻
Fracture
-
ConchoidalWalter Schumann, Splintery
Cleavage
{???} Indistinct
{100} Distinct, {110} Distinct
Mohs Hardness
5.55.5-6
2
10
👆🏻
Chemical Composition
Mn2+9(SiO 4) 4(OH,F) 2Anthony et al , Handbook of mineralogy (2001)
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