Formula: (Y,U,Fe)(Ta,Nb)O4
Origin of name: from yttrium and tantalite
Crystal system: orthorhombic
Crystal class: unknown
Twinning:
Unit cell:
Colour: Black, blackish-brown, yellowish brown, yellow
Diaphaneity: Opaque to translucent in thin fragments
Luster: Submetallic
Habit: Metamict (amorphous due to radiation damage), prismatic
Hardness: 5 to 5.5
Specific gravity: 5.5-5.9
Cleavage: 1; {010} distinct
Tenacity: Conchoidal fracture
Streak: Gray
Synonyms/varieties:
Comments: dimorphous with formanite
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