Formula: (Mn,Fe)(Nb,Ta)2O6
Origin of name: From manganese and ferrocolumbite
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour:
Diaphaneity:
Luster:
Habit: Crystals thin to thick tabular or short prismatic
Hardness: 6
Specific gravity: 5.28
Cleavage: 2; {100} distinct
Tenacity:
Streak:
Synonyms/varieties:
Comments: Series with manganotantalite and ferrocolumbite
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