Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.82-4.002.72-2.75
1
7.18
👆🏻
Fracture
-
Uneven
Cleavage
{???} Indistinct
Perfect on [001], good on [010], imperfect on [110]
Mohs Hardness
5.56-6.5
2
10
👆🏻
Chemical Composition
Mn2+9(SiO 4) 4(OH,F) 2Anthony et al , Handbook of mineralogy (2001)
Ca(70-90%)Na(30-10%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)