Minium

oxide

metamorphic

Formula: Pb2+2Pb4+O4 multiple oxide
Specific gravity: 9.05
Hardness: 2½
Streak: Orange-yellow
Colour: Red to brownish red
Solubility: Soluble in hydrochloric acid with evolution of Cl2. Decomposed by nitric acid, with brown residue of PbO2
Environments:

Metamorphic environments

Minium occurs in the oxidised portions of lead ore deposits. It is associated with native lead and galena at the Jay Gould Mine, Idaho, USA, with galena, cerussite and iron oxides at Leadville, Colorado, USA, with massicot and cerussite at the Santa Fe mine, Mexico, and with native lead at Långban, Sweden.

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