Formula: [Fe2(Al,Fe)]Al6Si6O18(BO3)3(OH)4
Origin of name: For Franklin Foit Jr., American mineralogist
Crystal system: Hexagonal
Crystal class: 3/m
Twinning:
Unit cell:
Colour: Bluish black
Diaphaneity: Translucent, transparent
Luster: Vitreous
Habit: Striated prisms
Hardness: 7
Specific gravity: 3.17
Cleavage: None
Tenacity:
Streak: Grayish white
Synonyms/varieties:
Comments:
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