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Melanotekite

Year of discovery: 1880 (Längban, Sweden), 2011 (Japan)

Locality list: A locality of melanotekite

• Pb₂Fe₂Si₂O₉
• [Pb²⁺₂][Fe³⁺₂][O₂|Si₂O₇]^10-

• Class: Sorosilicate - Oxide

• Fe => Mn: Kentrolite (Series)

• Color: Black
• Streak: Dark green
• Luster: Sub-Metallic
• Diaphaneity: Opaque

• Cleavage: Good
• Hardness: 6.5
• Density: 5.7

• System: Orthorhombic
• Group: 222, C222₁
• Lattice: a=6.9, b=11.0, c=10.1