Formula: MnTa2O6
Origin of name: From manganese and ferrotantalite
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning: on {021} or {023}, occasional trillings
Unit cell: a = 5.722 Å, b = 14.47 Å, c = 5.097Å
Colour: Brownish black with reddish brown or red internal reflections
Diaphaneity:
Luster: Vitreous to resinous
Habit: Crystals short prismatic, equant or thick tabular; massive
Hardness: 6 to 6.5
Specific gravity: 8.003
Cleavage: 2 {010} distinct, {100} indistinct
Tenacity: Subconchoidal to uneven; brittle
Streak: Dark red
Synonyms/varieties: Alvarolite
Comments: Dimorphous with manganotapiolite; series with manganocolumbite and ferrotantalite
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