Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.55-2.653.32-3.43
1
7.18
👆🏻
Fracture
Conchoidal
Conchoidal
Cleavage
Perfect {10 1 0}
Poor on {110} and {100} very poor on {001}
Mohs Hardness
5.5-66-7
2
10
👆🏻
Chemical Composition
(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)
Ca10(Mg,Fe)2Al4(SiO4)5(Si2O7)2(OH)4