Formula: KNa2Li(Mn,Fe)2Ti2Si8O24
Origin of name: From manganese and neptunite
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 16.38 Å, b = 12.48 Å, c = 10.01 Å, β = 115.4°
Colour: Red
Diaphaneity:
Luster: Vitreous to resinous
Habit: Crystals prismatic, mostly square cross section
Hardness: 5 to 6
Specific gravity: 3.23
Cleavage: 1; {110} perfect
Tenacity:
Streak: Brick red to reddish brown
Synonyms/varieties:
Comments: Series with neptunite
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