Tenacity
-
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
4.33-4.423.25-3.35
1
7.18
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Fracture
-
Conchoidal, ConchoidalWalter Schumann
Cleavage
Perfect
Perfect in three directions
Mohs Hardness
4.55
2
10
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Chemical Composition
Ca(Nd,Ce,La) 2(CO 3) 3F 2Ulrich Henn and Claudio C.
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references