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Pumpellyite-(Mn2+)

Year of discovery: 1981 (Japan as the first occurence in the World)

Locality list: 9 localities of pumpellyite-(Mn2+)

• Ca₂MnAl₂Si₃O₁₁(OH)₂,H₂O
• Ca₂(Mn,Mg,Fe²⁺)(Al,Mn³⁺,Fe³⁺)₂Si₃O₁₁(OH)₂,H₂O
• [Ca²⁺₂][Mn²⁺][Al³⁺₂][(OH)₂|SiO₄|Si₂O₇]^13-,H₂O

• Class: Pumpellyite series - Pumpellyite group
• Class: Sorosilicate - Nesosilicate - Hydroxide - Hydrate

• Mn => Fe: Pumpellyite-(Fe2+)
• Mn => Mg: Pumpellyite-(Mg)

• Mn(OH) => AlO: Pumpellyite-(Al)
• Mn(OH) => FeO: Pumpellyite-(Fe3+)

• Al => Mn: Okhotskite

• Streak: Gray, Pinkish brown
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Habit: Tabular on {001} elongated to [010], Granular
• Aggregate: Loose radial

• Cleavage: Good on {001} and {100} (2 planes)
• Hardness: 5.5
• Density: 3.2

• System: Monoclinic
• Group: 2/m, A2/m
• Lattice: a=8.9, b=6.0, c=19.2, β=97.8

Etymology: Raphael Pumpelly (1837-1923), American geologist