Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-2.656.50-7.00
1
7.18
👆🏻
Fracture
Uneven, Conchoidal
Irregular, Conchoidal
Cleavage
Perfect on {001}, very good on {010}, imperfect on {110}
On {011}, distinct; on {001}, {013}, indistinct
Mohs Hardness
6-6.53
2
10
👆🏻
Chemical Composition
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
PbMoO 4Walter Schumann , Gemstones of the world (2001)