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Chloritoid [abbr. Cld ]

Year of discovery: 1837 (Kosoi brod village, Russia), 1899 (Japan)

Locality list: 38 localities of chloritoid

• FeAl₂SiO₅(OH)₂
• (Fe,Mg,Mn)Al₂SiO₅(OH)₂
• [Fe²⁺][Al³⁺₂][(OH)₂|O|SiO₄]^8-

• Class: Chloritoid group
• Class: Nesosilicate - Oxide - Hydroxide

• Fe => Mn: Ottrélite (Ottrelite)
• Fe => Mg: Magnesiochloritoid

• SiO₄ => GeO₄: Carboirite (Series)

• Color: Dark green, Dark gray
• Streak: Pale green
• Luster: Vitreous
• Diaphaneity: Translucent

• Habit: Pseutohexagonal platy

• Cleavage: Perfect on {001} (1 plane), Good on {110} (2 planes)
• Hardness: 6.5
• Density: 3.5

• System: Monoclinic (2M), Triclinic (1A) (Layer-stacking polytype)
• Group: 2/m, C2/c
• Lattice: a=9.5, b=5.5, c=18.2, β=101.9