Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.523.355-3.433
1
7.18
👆🏻
Fracture
-
Uneven
Cleavage
{100} Perfect, {001} Perfect
{???} Good, {???} Good
Mohs Hardness
5-5.5-9999
2
10
👆🏻
Chemical Composition
Na(Mn2+ ,Ca) 2Si 3O 8(OH)Michael OâDonoghue , Gems, Sixth Edition (2006)
(Ca,Mn2+ ,Fe2+ ) 3Al 2BSi 4O 15(OH)Anthony et al , Handbook of mineralogy (2001)