Formula: NaNbO3
Origin of name: Locality; Lueshe, Zaire
Crystal system: Orthorhombic pseudocubic
Crystal class: 2 2 2
Twinning:
Unit cell: a = 5.51, b = 5.53, c = 15.5
Colour: Black, brown
Diaphaneity: Translucent to opaque
Luster:
Habit: Crystals cubes, faces lightly striated
Hardness: 5.5
Specific gravity: 4.44
Cleavage: 1; {001} imperfect, easy
Tenacity:
Streak: Grey
Synonyms/varieties:
Comments: Dimorphous with natroniobite
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