Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.9-3.52.69-2.72
1
7.18
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Fracture
Conchoidal
Uneven, Conchoidal
Cleavage
{110} Perfect, {???} Distinct, {???} Distinct
Perfect on {001}, less perfect on {010}, intersecting at near 90°; distinct on {110}
Mohs Hardness
5.5-66-6.5
2
10
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Chemical Composition
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)
(Na,Ca)1-2Si3-2O8