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Chamosite (Photo) [abbr. Chm ]

Year of discovery: 1820 (Haut de Cry, Switzerland), 1908 (Japan)

Locality list: 63 localities of chamosite

• Fe₅Al(AlSi₃)O₁₀(OH)₈
• (Fe²⁺,Mg,Fe³⁺)₅Al(AlSi₃)O₁₀(OH,O)₈
• [Fe²⁺₅][Al³⁺][(OH)₈|AlSi₃O₁₀]^13-

• Class: Chlorite group
• Class: Phyllo-Aluminosilicate
• Variety: Thuringite (+Fe³⁺)

• Polymorph: Orthochamosite (Orthorhombic)

• Fe => Mg: Clinochlore
• Fe => Ni: Nimite
• Fe => Mn: Pennantite

• Color: Dark green, Grayish green
• Streak: Grayish green
• Luster: Vitreous
• Diaphaneity: Translucent

• Habit: Platy
• Aggregate: Globular

• Cleavage: Perfect on {001} (1 plane)
• Hardness: 3
• Density: 3.2

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=5.4, b=9.3, c=14.2, β=97.9