Tenacity
-
-
Solubility
-
HCl soluble
Durability
-
-
Specific Gravity
2.58-2.744.27-4.29
1
7.18
👆🏻
Fracture
ConchoidalWalter Schumann, Splintery
Uneven
Cleavage
{100} Distinct, {110} Distinct
Perfect {010}
Mohs Hardness
5.5-65-5.5
2
10
👆🏻
Chemical Composition
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
FeO(OH)Arthur Thomas , Gemstones (2009)