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Pumpellyite-(Fe2+)

Year of discovery: 1971 (Ivakin Creek, Russia), 1977 (Japan)

Locality list: 5 localities of pumpellyite-(Fe2+)

• Ca₂FeAl₂Si₃O₁₁(OH)₂,H₂O
• Ca₂(Fe,Al,Mn,Mg)Al₂Si₃O₁₁(OH)₂,H₂O
• [Ca²⁺₂][Fe²⁺][Al³⁺₂][(OH)₂|SiO₄|Si₂O₇]^13-,H₂O

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

• Fe => Mn: Pumpellyite-(Mn2+)
• Fe => Mg: Pumpellyite-(Mg) (Series)

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

• Al => Fe: Julgoldite-(Fe2+) (Series)

• Al(OH) => FeO: Julgoldite-(Fe3+)

• Color: Greenish black, Bluish green, Brown
• Streak: White
• Luster: Vitreous
• Diaphaneity: Translucent

• Habit: Acicular
• 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=8.5, b=6.0, c=19.4, β=100.4

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