Formula: (Mn,Fe)(Ta,Nb)2O6
Origin of name: From manganese and tapiolite
Crystal system: Tetragonal
Crystal class: 4/m 2/m 2/m
Twinning:
Unit cell:
Colour: Dark brown
Diaphaneity: Translucent to opaque
Luster:
Habit: Crystals prismatic, faces poorly developed
Hardness: 5.5 to 6
Specific gravity: 7.72
Cleavage: None
Tenacity:
Streak: Dark brown
Synonyms/varieties:
Comments: Mn analogue of ferrotapiolite; dimorphous with manganotantalite
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