Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
6.50-7.002.54-2.78
1
7.18
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Fracture
Irregular, Conchoidal
Conchoidal
Cleavage
On {011}, distinct; on {001}, {013}, indistinct
Good in three directions
Mohs Hardness
35-6
2
10
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Chemical Composition
PbMoO 4Walter Schumann , Gemstones of the world (2001)
K(Ca,Na) 2Si 4O 10(OH,F) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references