Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.83-3.892.58-2.74
1
7.18
👆🏻
Fracture
Uneven, Conchoidal
ConchoidalWalter Schumann, Splintery
Cleavage
Perfect on {01 1 1}
{100} Distinct, {110} Distinct
Mohs Hardness
3.5-4.55.5-6
2
10
👆🏻
Chemical Composition
Fe2+ CO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Na 4Al 3Si 9O 24Cl to Ca 4Al 6Si 6O 24(CO 3,SO 4)Walter Schumann , Gemstones of the world (2001) More from other references