Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.55-2.653.355-3.433
1
7.18
👆🏻
Fracture
Conchoidal
Uneven
Cleavage
Perfect {10 1 0}
{???} Good, {???} Good
Mohs Hardness
5.5-6-9999
2
10
👆🏻
Chemical Composition
(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)
(Ca,Mn2+ ,Fe2+ ) 3Al 2BSi 4O 15(OH)Anthony et al , Handbook of mineralogy (2001)