Formula: (Ce,La)(Y,U,Fe)(Ti,Fe)20(O,OH)38
Origin of name: For Tennatt David, Australian geologist
Crystal system: Hexagonal
Crystal class: -3
Twinning:
Unit cell:
Colour: Black to gray-black, surface oxidized to brownish-black, dark brown reddish
Diaphaneity: Opaque
Luster: Vitreous to submetallic
Habit: Crystals tabular or pyramidal, or with rough cuboidal form in masses
Hardness: ~ 6
Specific gravity: 4.42
Cleavage:
Tenacity:
Streak:
Synonyms/varieties:
Comments: Three distinct species with the extensions -(Ce), -(La) and -(Y) indicating the predominant rare earth cation in the formula
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