Formula: Ca(Fe,Mg)3(Al,Mg)6(BO3)3Si6O18(OH)4
Origin of name: From iron (Latin ferrum) and uvite
Crystal system: Hexagonal
Crystal class: 3m
Twinning:
Unit cell:
Colour: Dark brown to black
Diaphaneity:
Luster: Vitreous to dull
Habit: Subhedral to anhedral grains to 2 mm
Hardness: 7
Specific gravity: 3.207
Cleavage: None
Tenacity:
Streak: Gray
Synonyms/varieties:
Comments: Iron analogue of uvite
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