Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.26-3.366.50-7.00
1
7.18
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Fracture
Conchoidal
Irregular, Conchoidal
Cleavage
Good on {100}
On {011}, distinct; on {001}, {013}, indistinct
Mohs Hardness
6.5-73
2
10
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Chemical Composition
(Ca,Fe,Mn,Mg) 3Al 2BSi 4O 15(OH)Walter Schumann , Gemstones of the world (2001) More from other references
PbMoO 4Walter Schumann , Gemstones of the world (2001)