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Pyrosmalite-(Mn) (Photo)

Year of discovery: 1953 (Sterling mine, USA), 1957 (Japan)

Locality list: 6 localities of pyrosmalite-(Mn)

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

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

• Polymorph: Friedelite (Monoclinic)

• Mn => Fe: Pyrosmalite-(Fe) (Series)

• (OH)₁₀ => (OH)₈Cl₂: Mcgillite

• Color: Reddish brown, Dark green, Gray
• Streak: Yellowish brown
• Luster: Vitreous
• Diaphaneity: Translucent

• Habit: Hexagonal platy

• Cleavage: Good on {0001} (1 plane)
• Hardness: 4.5
• Density: 3.1

• System: Trigonal
• Group: (-3)m, P(-3)m1
• Lattice: a=13.4, c=7.2

Synonym: Manganpyrosmalite