Tenacity
-
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
3.55-3.733.25-3.35
1
7.18
👆🏻
Fracture
Conchoidal, Uneven
Conchoidal, ConchoidalWalter Schumann
Cleavage
none
Perfect in three directions
Mohs Hardness
7-7.55
2
10
👆🏻
Chemical Composition
Ca 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references