Formula: FeFe2O4
Origin of name: After locality; lands of ancient Magnetes, Thessaly, Greece
Crystal system: Cubic
Crystal class: 4/m -3 2/m
Twinning: Common by spinel law
Unit cell: a = 8.397Å
Colour: Iron-black, grayish black
Diaphaneity:
Luster: Splendent metallic to dull
Habit: Crystals octahedral, may be highly modified or dodecahedral and striated; massive, compact or fine to coarse granular
Hardness: 5.5 to 6.5
Specific gravity: 5.175
Cleavage: 1; {111} parting good
Tenacity: Subconchoidal to uneven; brittle
Streak: Black
Synonyms/varieties: Heraclion, Ishkulite (Cr-rich var.), Lodestone (magnetic var.)
Comments: Series with jacobsite and with magnesioferrite
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