Tenacity
-
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
2.08-2.163.30-3.50
1
7.18
👆🏻
Fracture
Irregular/uneven
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
distinct/good on {1011}
Perfect on {110}, poor on {101}, {001} rare
Mohs Hardness
4.55
2
10
👆🏻
Chemical Composition
CaAl 2Si 4O 12 -6H 2OArthur Thomas , Gemstones (2009)
Zn 4Si 2O 7(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references