Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.33-2.375.9-6.3
1
7.18
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Fracture
Uneven
Conchoidal, Uneven
Cleavage
Perfect on {001}, imperfect on {110}
On {101}, distinct; on {112}, interrupted; on {001}, indistinct
Mohs Hardness
4.5-54.5-5
2
10
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Chemical Composition
(K,Na)Ca4Si8O20(F,OH)•8(H2O)
CaWO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references