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Caryopilite (Photo)

Year of discovery: 1889 (Harstigen mine, Sweden), 1935 (Japan)

Locality list: 211 localities of caryopilite

• Mn₃Si₂O₅(OH)₄
• (Mn,Mg)₃(Si,As)₂O₅(OH,Cl)₄
• Mn₃[(OH)₄|Si₂O₅]

• Class: 1:1 layer, Island-Tetrahedral < Modulated hydrous < Phyllosilicate subclass < Silicate class
• Class: Phyllosilicate - Hydroxide
• Erroneously recongnized as bementite for years in Japan.

• Mn => Mg: Antigorite, Chrysotile, Lizardite
• Mn => Ni: Népouite(Nepouite)
• Mn => Fe: Greenalite

• Color: Brown, Yellow
• Streak: Pale brown
• Luster: Vitreous
• Diaphaneity: Translucent

• Aggregate: Massive

• Cleavage: Perfect on {001} (1 plane)
• Hardness: 3-3.5
• Density: 2.9

• System: Monoclinic
• Group: 2/m, Cm
• Lattice: a=5.7, b=9.8, c=7.5, β=104.5