Formula: (Ca,Fe,Mn,Na)2(Sb,Ti)2O6(O,OH,F)
Origin of name: for Jean Baptiste Louis Rome de L'Isle, French crystallographer
Crystal system: cubic
Crystal class: 4/m -3 2/m
Twinning:
Unit cell:
Colour: pale yellow to dark brown
Diaphaneity: transparent to nearly opaque
Luster: vitreous to greasy
Habit: crystals octahedral, small, embedded groups, massive
Hardness: 5.5 to 6.5
Specific gravity: 4.7 to 5.4
Cleavage: 1; {111} imperfect
Tenacity:
Streak: pale yellow to nearly colourless
Synonyms/varieties:
Comments:
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