Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.9-3.52.72-2.75
1
7.18
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Fracture
Conchoidal
Uneven
Cleavage
{110} Perfect, {???} Distinct, {???} Distinct
Perfect on [001], good on [010], imperfect 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)
Ca(70-90%)Na(30-10%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)