Formula: (Mn,Mg)4SbFeO8
Origin of name: From locality; Filipstad, Sweden
Crystal system: Orthorhombic pseudocubic
Crystal class: Unknown
Twinning:
Unit cell:
Colour: Black
Diaphaneity:
Luster:
Habit: Euhedral to subhedral crystals to 200 µm, dominantly octahedral habit, singles and aggregates
Hardness: 6.3
Specific gravity:
Cleavage: None
Tenacity:
Streak: Brown
Synonyms/varieties:
Comments:
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