Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.55-2.654.95-5.0
1
7.18
👆🏻
Fracture
Conchoidal
Uneven
Cleavage
Perfect {10 1 0}
Imperfect to indistinct on {10 1 0}, parting on {0001}
Mohs Hardness
5.5-64-5
2
10
👆🏻
Chemical Composition
(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)
(Ce,La)(CO 3)FMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references