Formula: (Ce,La)F3
Origin of name: From fluorine and cerium
Crystal system: Hexagonal
Crystal class: -3 2/m
Twinning:
Unit cell:
Colour: Yellow to reddish-brown
Diaphaneity: Transparent to translucent
Luster: Vitreous to resinous, pearly on cleavage
Habit: Crystals prismatic, elongated parallel to c axis or tabular; massive or coarse granular
Hardness: 4 to 5
Specific gravity: 5.93 to 6.14
Cleavage: 2; {0001} good, {11-20} indistinct
Tenacity:
Streak: Whitish
Synonyms/varieties:
Comments: Two distinct species with the extensions -(Ce) and -(La) indicating the predominant rare earth cation in the formula
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