Tenacity
Brittle
-
Solubility
Soluble
-
Durability
-
-
Specific Gravity
2.20-2.233.1-3.2
1
7.18
👆🏻
Fracture
Irregular/uneven, Uneven
-
Cleavage
Perfect on {110} and {1 1 0}
Vitreous, pearly on cleavage
Mohs Hardness
5-5.53-4
2
10
👆🏻
Chemical Composition
CaAl 2Si 3O 10 · 3H 2OUlrich Henn and Claudio C.
(Fe2+ ,Mg,Mn2+ ) 3(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references