Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.25-3.502.60-2.64
1
7.18
👆🏻
Fracture
Conchoidal, Fibrous
Uneven, Splintery, Conchoidal
Cleavage
{001} perfect and {100} imperfect
Absent
Mohs Hardness
6-76.5-7
2
10
👆🏻
Chemical Composition
CaAl 2(Fe3+ ,Al)Si 3O 12(OH)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
SiO 2Arthur Thomas , Gemstones (2009)