Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.9-3.52.60-2.65
1
7.18
👆🏻
Fracture
Conchoidal
Uneven, Conchoidal
Cleavage
{110} Perfect, {???} Distinct, {???} Distinct
Perfect on {001}, very good on {010}, imperfect on {110}
Mohs Hardness
5.5-66-6.5
2
10
👆🏻
Chemical Composition
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)