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Sérandite (Photo), Serandite

Year of discovery: 1931 (Rouma island, Guinea), 1972 (Japan)

Locality list: 8 localities of sérandite

• NaMn₂Si₃O₈(OH)
• Na(Mn,Ca)₂Si₃O₈(OH)
• [Na⁺][Mn²⁺₂][HSi₃O₉]^5-

• Class: Wollastonite group < 3-periodic < Pyroxenoid
• Class: Inosilicate (Single chain) - Hydroxide

• Na => Li: Tanohataite

• Mn => Ca: Pectolite (Series)

• LiH => Mn: Vittinkiite, Pyroxmangite

• Color: Pale pink, Red
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Perfect on {100} and {001} (2 planes)
• Hardness: 5-5.5
• Density: 3.3

• System: Triclinic
• Group: (-1), P(-1)
• Lattice: a=7.7, b=6.9, c=6.7, α=90.5, β=94.1, γ=102.8