Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.50-2.802.98-3.10
1
7.18
👆🏻
Fracture
-
Uneven, Conchoidal
Cleavage
Perfect
{100} Perfect, {110} Good, {011} Distinct
Mohs Hardness
5-6.55.5-6
2
10
👆🏻
Chemical Composition
Na 4(Al,Si) 12O 24Cl to Ca 4(Si,Al) 12O 24(CO 3,SO 4)Arthur Thomas , Gemstones (2009)
LiAl(PO 4)(OH,F)Walter Schumann , Gemstones of the world (2001) More from other references