Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.60-3.613.19-3.56
1
7.18
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Fracture
Conchoidal
Uneven, Conchoidal
Cleavage
Imperfect/fair/absent
{110} Perfect, {010} Indistinct
Mohs Hardness
8-8.55.5-6
2
10
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Chemical Composition
Mg 3Al 8BeO 16Walter Schumann , Gemstones of the world (2001) More from other references
(Ca,Na)(Mg,Fe,Al,Ti)(Si,Al) 2O 6Anthony et al , Handbook of mineralogy (2001)