Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.25-3.502.74-2.76
1
7.18
👆🏻
Fracture
Conchoidal, Fibrous
Uneven
Cleavage
{001} perfect and {100} imperfect
{010} Perfect, {001} Distinct
Mohs Hardness
6-73.5-4
2
10
👆🏻
Chemical Composition
CaAl 2(Fe3+ ,Al)Si 3O 12(OH)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Fe3+ PO 4 · 2H 2OAnthony et al , Handbook of Mineralogy (2001)