Tenacity
-
Brittle
Solubility
-
Dilute acid
Durability
-
-
Specific Gravity
2.77-2.882.93-2.96
1
7.18
👆🏻
Fracture
Uneven
Subconchoidal, Conchoidal
Cleavage
Perfect basal
Distinct on {010}, imperfect {110} and {011}
Mohs Hardness
2.53.5-4
2
10
👆🏻
Chemical Composition
K(Al,Cr) 3Si 3O 10(OH) 2Gemdat.org , Management Team (2012)
CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references