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Ericssonite-2O

Year of discovery: 1971 (Långban, Sweden), 1975 (Japan)

Locality list: A locality of ericssonite-2O

• BaMn₂FeSi₂O₈(OH)
• [Ba²⁺][Mn²⁺₂][Fe³⁺][OH|O|Si₂O₇]^9-

• Class: Sorosilicate - Oxide - Hydroxide

• Color: Dark red
• Streak: Brown
• Luster: Vitreous
• Diaphaneity: Translucent

• Cleavage: Perfect on {100} (1 planes), Distinct on {011} (2 planes)
• Hardness: 4.5
• Density: 4.2

• System: Orthorhombic (2O), Monoclinic (2M) (Layer-stacking polytype)
• Group: mmm, Pmmn
• Lattice: a=20.3, b=7.0, c=5.3

Synonym: Orthoericssonite