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Friedelite

Year of discovery: 1876 (Montagne d'Azet, France), 2024 (Japan)

Locality list: A locality of friedelite

• Mn₈Si₆O₁₅(OH)₁₀
• (Mn,Fe)₈Si₆O₁₅(OH,Cl)₁₀
• [Mn²⁺₈][(OH)₁₀|(Si₂O₅)₃]^16-

• Class: 1:1 layer, Island-Tetrahedral < Modulated hydrous < Phyllosilicate subclass < Silicate class
• Class: Phyllosilicate - Hydroxide

• Polymorph: Pyrosmalite-(Mn) (Trigonal)

• Mn => Fe: Pyrosmalite-(Fe) (Series)

• (OH)₁₀ => (OH)₈Cl₂: Mcgillite

• Color: Reddish brown, Pale brown
• Streak: White
• Luster: Sub-vitreous, Waxy, Greasy
• Diaphaneity: Translucent, Transparent

• Habit: Hexagonal platy

• Cleavage: Good on {0001} (1 plane)
• Hardness: 4 - 5
• Density: 3.0 - 3.1

• System: Monoclinic
• Group: 2/m, B2/m
• Lattice: a=23.3, b=13.4, c=7.4, β=105.1