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Marsturite (Photo)

Year of discovery: 1978 (Franklin mine, USA), 1990 (Japan)

Locality list: 7 localities of marsturite

• NaCaMn₃Si₅O₁₄(OH)
• [Na⁺][Ca²⁺][Mn²⁺₃][HSi₅O₁₅]^9-

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

• Na => Li: Lithiomarsturite

• Ca => Mn: Natronambulite

• Color: Yellowish brown, Pale pink, Colorless
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Indistinct on {100} and {001} (2 planes)
• Hardness: 6
• Density: 3.7

• System: Triclinic
• Group: 1, P1
• Lattice: a=7.7, b=12.0, c=6.8, α=85.3, β=94.1, γ=111.0