Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
6.50-7.002.90-3.10
1
7.18
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Fracture
Irregular, Conchoidal
Uneven, Conchoidal
Cleavage
On {011}, distinct; on {001}, {013}, indistinct
Poor/indistinct on {1120} and {1011}
Mohs Hardness
37
2
10
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Chemical Composition
PbMoO 4Walter Schumann , Gemstones of the world (2001)
Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) More from other references