Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
-99992.55-2.65
1
7.18
👆🏻
Fracture
-
Conchoidal
Cleavage
{???} Good, {???} Good, {???} Distinct
Perfect {10 1 0}
Mohs Hardness
-99995.5-6
2
10
👆🏻
Chemical Composition
(Na,Ca)2BeSi2(O,OH)7
(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)