Formula: FeTa2O6
Origin of name: From iron and manganotantalite
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: Black to brownish black, tarnishes iridescent
Diaphaneity: Opaque
Luster: Submetallic to weakly vitreous
Habit: Crystals thin to thick tabular, short prismatic, equant or pyramidal; aggregates of parallel to divergent crystals
Hardness: 6 to 6.5
Specific gravity: 8.2
Cleavage: 2; {010} distinct, {100} less distinct
Tenacity:
Streak:
Synonyms/varieties:
Comments: Series with manganotantalite and with ferrocolumbite; dimorphous with ferrotapiolite
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