Tenacity
-
Brittle
Solubility
-
insoluble in water
Durability
-
-
Specific Gravity
4.33-4.425.00-5.20
1
7.18
👆🏻
Fracture
-
Uneven, Conchoidal, ConchoidalWalter Schumann
Cleavage
Perfect
Indistinct on {001}; partings on {011} and {111}
Mohs Hardness
4.56-6.5
2
10
👆🏻
Chemical Composition
Ca(Nd,Ce,La) 2(CO 3) 3F 2Ulrich Henn and Claudio C.
FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references