Minium Pb3O4 Tetragonal
Minium is a rare mineral found as red dull to greasy masses in the oxidized zone of lead deposits where it forms as the result of the alteration of galena.
IOWA COUNTY: Minium is reported as masses encrusting galena in the lead deposits near Mineral Point. (Palache, Berman and Frondel, 1944)
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