Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-2.652.90-3.10
1
7.18
👆🏻
Fracture
Uneven, Conchoidal
Splintery, Granular
Cleavage
Perfect on {001}, very good on {010}, imperfect on {110}
None
Mohs Hardness
6-6.56-6.5
2
10
👆🏻
Chemical Composition
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
Ca 2(Mg,Fe) 5(OH) 2Walter Schumann , Gemstones of the world (2001) More from other references