Tenacity
-
Brittle
Solubility
-
insoluble
Durability
-
-
Specific Gravity
4.33-4.426.86-7.03
1
7.18
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Fracture
-
Subconchoidal, Uneven, Conchoidal, Irregular
Cleavage
Perfect
{100} imperfect, {110} indistinct; partings on {111} or {011}
Mohs Hardness
4.56-7
2
10
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Chemical Composition
Ca(Nd,Ce,La) 2(CO 3) 3F 2Ulrich Henn and Claudio C.
SnO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references