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Natronambulite

Year of discovery: 1985 (Japan as the first occurence in the World)

Locality list: 9 localities of natronambulite

• NaMn₄Si₅O₁₄(OH)
• (Na,Li)(Mn,Ca)₄Si₅O₁₄(OH)
• [Na⁺][Mn²⁺₄][HSi₅O₁₅]^9-

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

• Na => Li: Nambulite (Series)

• Mn₄ => Mn₃Ca: Marsturite

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

• Cleavage: Perfect on {100} and {001} (2 planes)/li>
• Hardness: 5.5-6
• Density: 3.5

• System: Triclinic
• Group: (-1), P(-1)
• Lattice: a=7.6, b=11.8, c=6.7, α=92.8, β=94.6, γ=106.9

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