Formula: (Y,Ce,Ca)(Ta,Nb,Ti)2(O,OH)6
Origin of name: from tantalum and euxenite
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 5.18, b = 14.57, c = 5.52
Colour: brownish black
Diaphaneity: Subtranslucent to opaque
Luster: Resinous
Habit: Crystals tabular, indistinct, metamict (amorphous due to radiation damage), anhedral to subhedral grains
Hardness: 5 to 6
Specific gravity: 5.4 to 5.9
Cleavage: 1; Indistinct
Tenacity: Subconchoidal fracture
Streak: Brownish gray
Synonyms/varieties: Delorenzite
Comments:
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