Formula: (Y,Th,Ca,U)(Ti,Fe)2(O,OH)6
Origin of name: for yttrium and Greek for mixture
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: Black
Diaphaneity: Opaque to translucent in thin fragments
Luster: Dull, resinous on fracture
Habit: crystals prismatic or thin tabular, metamict (amorphous due to radiation damage)
Hardness: 5.5 to 6
Specific gravity: 4.80
Cleavage: None
Tenacity: Conchoidal fracture
Streak: Reddish brown
Synonyms/varieties:
Comments: Radioactive
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