Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-2.643.25-3.50
1
7.18
👆🏻
Fracture
Uneven, Splintery, Conchoidal
Conchoidal, Fibrous
Cleavage
Absent
{001} perfect and {100} imperfect
Mohs Hardness
6.5-76-7
2
10
👆🏻
Chemical Composition
SiO 2Arthur Thomas , Gemstones (2009)
CaAl 2(Fe3+ ,Al)Si 3O 12(OH)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references