Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.32-3.436.50-7.00
1
7.18
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Fracture
Conchoidal
Irregular, Conchoidal
Cleavage
Poor on {110} and {100} very poor on {001}
On {011}, distinct; on {001}, {013}, indistinct
Mohs Hardness
6-73
2
10
👆🏻
Chemical Composition
Ca10(Mg,Fe)2Al4(SiO4)5(Si2O7)2(OH)4
PbMoO 4Walter Schumann , Gemstones of the world (2001)