Formula: (Y,Ce,Ca)(Ta,Ti,Nb)2O6
Origin of name: from tantalum and aeschynite
Crystal system: Orthorhombic, metamict
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 5.34, b = 10.97, c = 7.38
Colour: Brownish black to black
Diaphaneity: Transparent
Luster: Resinous
Habit: crystals prismatic, metamict
Hardness: 5.5-6
Specific gravity: 5.75-6.13 (on impure material)
Cleavage: None
Tenacity: Conchoidal fracture
Streak: Light yellowish brown
Synonyms/varieties:
Comments: series with aeschynite, radioactive
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