Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.55-2.653.80-4.15
1
7.18
👆🏻
Fracture
Conchoidal
Uneven
Cleavage
Perfect {10 1 0}
perfect along [010] and [100]
Mohs Hardness
5.5-63.5-4
2
10
👆🏻
Chemical Composition
(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)
Cu 5(SiO 3) 4(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references