Formula: NaCa2(Fe,Mg)4Ti(Si6Al2)O23(OH)
Origin of name: For ferrous iron (Fe2+) and kaersutite
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Dark brown to black
Diaphaneity:
Luster: Vitreous
Habit:
Hardness: 5 to 6
Specific gravity: 3.2 to 3.46
Cleavage: 3; {110} perfect, {100}{001} partings
Tenacity:
Streak:
Synonyms/varieties:
Comments: Series with kaersutite
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