Formula: SbFe2(SiO4)2(OH)
Origin of name: For E. Chapman, Canadian geologist
Crystal system: Monoclinic
Crystal class: m
Twinning:
Unit cell:
Colour: Olive-green to deep yellow
Diaphaneity:
Luster: Nonmetallic
Habit: Crystals lath-shaped; masses; powdery
Hardness: 2.5
Specific gravitiy: 3.69 to 3.75
Cleavage: None
Tenacity:
Streak: Greenish yellow to deep yellow
Synonyms/varieties:
Comments:
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