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Parsettensite

Year of discovery: 1923 (Parsettens Alp, Switzerland), 1951 (Japan)

Locality list: 3 localities of parsettensite

• K_1.2Mn₈Si₁₂O₂₆(OH)₁₀
• (K,Na,Ca)_1.2(Mn,Al)₈(Si,Al)₁₂O₂₆(OH)₁₀
• [K⁺_1.2][Mn²⁺₈][(OH)₁₀|(Si₆O₁₃)₂]

• Class: 2:1 layer, Island-Tetrahedral < Modulated hydrous < Phyllosilicate subclass < Silicate class
• Class: Phyllosilicate - Hydroxide
• Radioactive: Very weak

• Color: Yellowish brown, Reddish brown
• Streak: Yellowish brown
• Luster: Vitreous
• Diaphaneity: Transparent

• Habit: Fibrous, Platy
• Aggregate: Perpendicular to the vein

• Cleavage: Perfect on {001} (1 plane)
• Hardness: 1.5
• Density: 2.6

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=39.1, b=22.8, c=18.0, β=135.6