Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.58-2.74-9999
1
7.18
👆🏻
Fracture
ConchoidalWalter Schumann, Splintery
-
Cleavage
{100} Distinct, {110} Distinct
Indiscernible
Mohs Hardness
5.5-6-9999
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
Ca10(Mg,Fe)2(Si2O7)2(SiO4)2O(OH)2