Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.355-3.4332.55-2.65
1
7.18
👆🏻
Fracture
Uneven
Conchoidal
Cleavage
{???} Good, {???} Good
Perfect {10 1 0}
Mohs Hardness
-99995.5-6
2
10
👆🏻
Chemical Composition
(Ca,Mn2+ ,Fe2+ ) 3Al 2BSi 4O 15(OH)Anthony et al , Handbook of mineralogy (2001)
(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)