Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
6.50-7.002.60-2.65
1
7.18
👆🏻
Fracture
Irregular, Conchoidal
Uneven, Conchoidal
Cleavage
On {011}, distinct; on {001}, {013}, indistinct
Perfect on {001}, very good on {010}, imperfect on {110}
Mohs Hardness
36-6.5
2
10
👆🏻
Chemical Composition
PbMoO 4Walter Schumann , Gemstones of the world (2001)
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)