Tenacity
Brittle
Brittle
Solubility
-
insoluble
Durability
-
-
Specific Gravity
6.50-7.006.86-7.03
1
7.18
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Fracture
Irregular, Conchoidal
Subconchoidal, Uneven, Conchoidal, Irregular
Cleavage
On {011}, distinct; on {001}, {013}, indistinct
{100} imperfect, {110} indistinct; partings on {111} or {011}
Mohs Hardness
36-7
2
10
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Chemical Composition
PbMoO 4Walter Schumann , Gemstones of the world (2001)
SnO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references