Tenacity
-
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
2.08-2.163.25-3.35
1
7.18
👆🏻
Fracture
Irregular/uneven
Conchoidal, ConchoidalWalter Schumann
Cleavage
distinct/good on {1011}
Perfect in three directions
Mohs Hardness
4.55
2
10
👆🏻
Chemical Composition
CaAl 2Si 4O 12 -6H 2OArthur Thomas , Gemstones (2009)
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references