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Shirozulite

Year of discovery: 2004 (Japan as the first occurence in the World)

Locality list: A locality of shirozulite

• KMn₃AlSi₃O₁₀(OH)₂
• K(Mn,Mg)₃AlSi₃O₁₀(OH)₂
• [K⁺][Mn²⁺₃][(OH)₂|AlSi₃O₁₀]^7-

• Class: Trioctahedral < True mica group < Mica supergroup
• Class: Phyllo-Aluminosilicate - Hydroxide
• Radioactive: Very weak

• Mn => Mg: Phlogopite
• Mn => Fe: Annite
• Mn => Zn: Hendricksite

• Mg²⁺₃ => Al³⁺₂: Muscovite

• Color: Brown
• Luster: Pearly
• Diaphaneity: Transparent

• Habit: Hexagonal tabular

• Cleavage: Perfect on {001} (1 plane)
• Hardness: 3
• Density: 3.2

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=5.4, b=9.3, c=10.3, β=100.2

Etymology: Professor Haruo Shirozu, Japanese mineralogist of Kyushu University