Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.58-2.743.76-3.77
1
7.18
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Fracture
ConchoidalWalter Schumann, Splintery
-
Cleavage
{100} Distinct, {110} Distinct
{110} Perfect, {110} Perfect
Mohs Hardness
5.5-65-6
2
10
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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
(Fe,Mn) 7Si 7O 21Ulrich Henn and Claudio C.