Tenacity
Brittle
-
Solubility
-
insoluble
Durability
-
-
Specific Gravity
3.50-3.602.36
1
7.18
👆🏻
Fracture
Uneven
Uneven, Subconchoidal, Fibrous
Cleavage
Good on {110}, (110) ^ (1 1 0) ≈87°; parting on {100}
[110] perfect, [101] good, [010] distinct
Mohs Hardness
63.5-4
2
10
👆🏻
Chemical Composition
(Na,Fe,Ca)Si 2O 6Ulrich Henn and Claudio C.
Al 3(PO 4) 2(OH,F) 3 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references