Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.9-3.53.80-4.15
1
7.18
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Fracture
Conchoidal
Uneven
Cleavage
{110} Perfect, {???} Distinct, {???} Distinct
perfect along [010] and [100]
Mohs Hardness
5.5-63.5-4
2
10
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Chemical Composition
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)
Cu 5(SiO 3) 4(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references