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Pyrosmalite-(Fe)

Year of discovery: 1808 (Bjelke mine, Sweden), 1957 (Japan)

Locality list: 4 localities of pyrosmalite-(Fe)

• Fe₈Si₆O₁₅(OH)₁₀
• (Fe,Mn)₈Si₆O₁₅(OH,Cl)₁₀
• [Fe²⁺₈][(OH)₁₀|(Si₂O₅)₃]^16-

• Class: Pyrosmalite series < 1:1 layer, Island-Tetrahedral < Modulated hydrous < Phyllosilicate subclass < Silicate class
• Class: Phyllosilicate - Hydroxide
• Soluble in: HNO₃

• Fe => Mn: Pyrosmalite-(Mn) (Series), Friedelite

• Color: Dark green, Brown, Gray
• Streak: Pale green
• 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=13.3, c=7.1

Synonym: Ferropyrosmalite