Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.50-2.802.58-2.74
1
7.18
👆🏻
Fracture
-
ConchoidalWalter Schumann, Splintery
Cleavage
Perfect
{100} Distinct, {110} Distinct
Mohs Hardness
5-6.55.5-6
2
10
👆🏻
Chemical Composition
Na 4(Al,Si) 12O 24Cl to Ca 4(Si,Al) 12O 24(CO 3,SO 4)Arthur 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