Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
4.392.55-2.65
1
7.18
👆🏻
Fracture
Uneven
Conchoidal
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
Perfect {10 1 0}
Mohs Hardness
7.5-85.5-6
2
10
👆🏻
Chemical Composition
Fe2+ Al 2O 4Gemdat.org , Management Team (2012)
(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)