Formula: (Zn,Mn,Fe)(Fe,Mn)2O4
Origin of name: Locality; Franklin, New Jersey
Crystal system: Cubic
Crystal class: 4/m -3 2/m
Twinning: by spinel law
Unit cell: a = 8.441 Ǻ
Colour: Iron black
Diaphaneity:
Luster: Metallic to dull
Habit: Crystals octahedral, large, may be modified or rounded; massive, compact, coarse to fine granular
Hardness: 5.5 to 6.5
Specific gravity: 5.07 to 5.22
Cleavage: 1; {111} parting, fair
Tenacity: Subconchoidal to uneven; brittle
Streak: Reddish brown to black
Synonyms/varieties:
Comments:
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