Formula: Ca(Ce,La, Nd,Y)(CO3)2F
Origin of name: from Greek for confounding
Crystal system: monoclinic, pseudohexagonal
Crystal class: 2/m
Twinning: common on {0001} sometimes lamellar
Unit cell: a = 12.33 Å, b = 7.10 Å, c = 18.74 Å, b = 102.7°
Colour: brown, gray to grayish-yellow
Diaphaneity:
Luster: vitreous to greasy
Habit: crystals thin to thick tabular, pseudohexagonal, minute
Hardness: 4.5
Specific gravity: 3.90 to 4.15
Cleavage: 1; {0001} parting (?)
Tenacity: brittle
Streak:
Synonyms/varieties: doverite (synchysite-(Y))
Comments: three distinct species with the extension -(Ce), -(Nd) and -(Y) indicating the predominant rare earth cation in the formula
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