Formula: (Ti,Nb,Fe)3O6
Origin of name: After locality; Ilmen Mountains, Russia; and rutile
Crystal system: Tetragonal
Crystal class: 4/m 2/m 2/m
Twinning:
Unit cell:
Colour: Black
Diaphaneity: Opaque
Luster: Submetallic
Habit:
Hardness:
Specific gravity: 4.20
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments: Series with struverite
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