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Coronadite

Year of discovery: 1905 (Horseshore mine (Coronado mine), USA), 1980 (Japan)

Locality list: 3 localities of coronadite

• PbMn₈O₁₆
• [Pb²⁺][Mn⁴⁺₆][Mn³⁺₂][O₁₆]^32-

• Class: Cryptomelane group
• Class: Oxide

• Pb => Ba: Hollandite
• Pb => Sr: Strontiomelane
• Pb => K: Cryptomelane
• Pb => Na: Manjiroite

• Color: Dark gray, Black
• Streak: Brownish black
• Luster: Sub-Metallic
• Diaphaneity: Opaque

• Hardness: 4.5-5
• Density: 5.4

• System: Monoclinic
• Group: 2/m, I2/m
• Lattice: a=9.9, b=2.9, c=9.8, β=90.4