Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.60-3.612.9-3.5
1
7.18
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Fracture
Conchoidal
Conchoidal
Cleavage
Imperfect/fair/absent
{110} Perfect, {???} Distinct, {???} Distinct
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
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)