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Julgoldite-(Fe2+)

Year of discovery: 1971 (Långban, Sweden), 1992 (Japan)

Locality list: 3 localities of julgoldite-(Fe2+)

• Ca₂Fe₃Si₃O₁₁(OH)₂,H₂O
• Ca₂(Fe²⁺,Mg)(Fe³⁺,Al)₂Si₃O₁₁(OH)₂,H₂O
• [Ca²⁺₂][Fe²⁺][Fe³⁺₂][(OH)₂|SiO₄|Si₂O₇]^12-,H₂O

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

• Fe³⁺ => Al: Pumpellyite-(Fe2+) (Series)

• Fe => Mn: Okhotskite

• Fe₂(OH) => Al₂O: Pumpellyite-(Fe3+)

• Fe₃(OH) => MgAl₂O: Pumpellyite-(Mg) (Series)
• Fe₃(OH) => Al₃O: Pumpellyite-(Al)

• (OH) => O: Julgoldite-(Fe3+)

• Color: Dark green
• Luster: Sub-Metallic
• Diaphaneity: Translucent

• Hardness: 4.5
• Density: 3.6

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=19.4, b=6.1, c=8.9, β=97.6