Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.44-2.622.72-2.75
1
7.18
👆🏻
Fracture
Uneven
Uneven
Cleavage
Indiscernible
Perfect on [001], good on [010], imperfect on [110]
Mohs Hardness
2.5-5.56-6.5
2
10
👆🏻
Chemical Composition
H 4Mg 3Si 2O 9Walter Schumann , Gemstones of the world (2001) More from other references
Ca(70-90%)Na(30-10%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)