Tenacity
-
Brittle
Solubility
-
Dilute acid
Durability
-
-
Specific Gravity
2.60-2.642.93-2.96
1
7.18
👆🏻
Fracture
Uneven, Splintery, Conchoidal
Subconchoidal, Conchoidal
Cleavage
Absent
Distinct on {010}, imperfect {110} and {011}
Mohs Hardness
6.5-73.5-4
2
10
👆🏻
Chemical Composition
SiO 2Arthur Thomas , Gemstones (2009)
CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references