Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.54-2.785.35
1
7.18
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Fracture
Conchoidal
Conchoidal
Cleavage
Good in three directions
Perfect on {100}, imperfect on {001}
Mohs Hardness
5-62.5
2
10
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Chemical Composition
K(Ca,Na) 2Si 4O 10(OH,F) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
PbCu(SO 4)(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)