Tenacity
-
Elastic
Solubility
-
-
Durability
-
-
Specific Gravity
2.9-3.52.78-2.88
1
7.18
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Fracture
Conchoidal
-
Cleavage
{110} Perfect, {???} Distinct, {???} Distinct
Perfect on the {001}
Mohs Hardness
5.5-62-3
2
10
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Chemical Composition
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)
KAl 2AlSi 3O 10(OH) 2Walter Schumann , Gemstones of the world (2001) More from other references