Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.72-2.753.82-4.00
1
7.18
👆🏻
Fracture
Uneven
-
Cleavage
Perfect on [001], good on [010], imperfect on [110]
{???} Indistinct
Mohs Hardness
6-6.55.5
2
10
👆🏻
Chemical Composition
Ca(70-90%)Na(30-10%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
Mn2+9(SiO 4) 4(OH,F) 2Anthony et al , Handbook of mineralogy (2001)