Tenacity
-
Brittle
Solubility
-
Dilute acid
Durability
-
-
Specific Gravity
2.54-2.782.93-2.96
1
7.18
👆🏻
Fracture
Conchoidal
Subconchoidal, Conchoidal
Cleavage
Good in three directions
Distinct on {010}, imperfect {110} and {011}
Mohs Hardness
5-63.5-4
2
10
👆🏻
Chemical Composition
K(Ca,Na) 2Si 4O 10(OH,F) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references