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Nambulite (Photo)

Year of discovery: 1972 (Japan as the first occurence in the World)

Locality list: 13 localities of nambulite

• LiMn₄Si₅O₁₄(OH)
• (Li,Na)Mn₄Si₅O₁₄(OH)
• [Li⁺][Mn²⁺₄][HSi₅O₁₅]^9-

• Class: 5-periodic < Pyroxenoid
• Class: Inosilicate (Single chain) - Hydroxide

• Li => Na: Natronambulite (Series)

• Mn₄ => Mn₂Ca₂: Lithiomarsturite

• Color: Reddish brown, Orange
• Streak: Pale yellow
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Habit: Prismatic, Tabular

• Cleavage: Perfect on {001} (1 plane), Distinct on {100} and {010} (2 planes)
• Hardness: 6.5
• Density: 3.5

• System: Triclinic
• Group: (-1), P(-1)
• Lattice: a=7.6, b=11.8, c=6.7, α=92.8, β=95.1, γ=106.9

Etymology: Professor Matsuo Nambu (1917-2009), Japanese economic geologist of Tohoku University