Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.33-2.373.23-3.26
1
7.18
👆🏻
Fracture
Uneven
Conchoidal
Cleavage
Perfect on {001}, imperfect on {110}
Perfect on {010} imperfect on {100}
Mohs Hardness
4.5-56.5-7
2
10
👆🏻
Chemical Composition
(K,Na)Ca4Si8O20(F,OH)•8(H2O)
Mg 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)