Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
6.50-7.002.69-2.79
1
7.18
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Fracture
Irregular, Conchoidal
Conchoidal
Cleavage
On {011}, distinct; on {001}, {013}, indistinct
Poor on {0001}
Mohs Hardness
35.5-6.5
2
10
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Chemical Composition
PbMoO 4Walter Schumann , Gemstones of the world (2001)
KNa 2(Fe3+ ,Mn3+ ,Al) 2Li 3Si 12O 30Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references