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Chapmanite

Year of discovery: 1924 (Keeley-Frontier mine, Canada), 1969 (Japan)

Locality list: 3 localities of chamosite

• Fe₂Sb(SiO₄)₂(OH)
• [Fe³⁺₂][Sb³⁺][OH|O₃|Si₂O₅]

• Class: Bismutoferrite group
• Class: Phyllosilicate - Oxide - Hydroxide

• Sb => Bi: Bismutoferrite

• Color: Grayish green-Dark yellow
• Streak: Yellowish green-Dark yellowk
• Luster: Vitreous
• Diaphaneity: Translucent

• Hardness: 2.5
• Density: 3.7

• System: Monoclinic
• Group: m, Cm
• Lattice: a=5.2, b=9.0, c=7.7, β=100.4