Formula: (Fe,Fe,Ti)7SbO13(OH)
Origin of name: For Orville Derby, American geologist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning: trilings
Unit cell:
Colour: Black
Diaphaneity: Opaque
Luster: Resinous
Habit: Crystals prismatic; cruciform twins common , also trillings
Hardness: 5
Specific gravity: 4.53
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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