Formula: (Ce,La,Y,Th)5(Si,B)3(O,OH,F)13
Origin of name: from Greek for three and to cut
Crystal system: hexagonal
Crystal class: 6/m
Twinning:
Unit cell:
Colour: dark brown
Diaphaneity: translucent in thin splinters
Luster: vitreous to resinous
Habit: crystals acute triangular pyramidal
Hardness: 5.5
Specific gravity: 4.2
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments: two distinct species with the extensions -(Ce) and -(Y) indicating the predominant rare earth element in the composition
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