Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.55-2.632.72-2.75
1
7.18
👆🏻
Fracture
Uneven
Uneven
Cleavage
{001} Perfect, {010} Good
Perfect on [001], good on [010], imperfect on [110]
Mohs Hardness
6-6.56-6.5
2
10
👆🏻
Chemical Composition
KAlSi 3O 8Arthur Thomas , Gemstones (2009)
Ca(70-90%)Na(30-10%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)