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Formula: Pb(Mn4+6Mn3+2)O16
Multiple oxide, coronadite group
Specific gravity: 5.44
Hardness: 4½ to 5
Streak: Brownish black
Colour: Dark grey to black
Common impurities: Fe,Al,H2O
Environments:
Sedimentary environments
Metamorphic environments
Hydrothermal environments
Hot springs
Coronadite occurs as a primary mineral in hydrothermal veins or hot
springs, and it is of secondary origin in oxidised zones above
manganese deposits and bedded sedimentary rocks. hollandite,
pyrolusite and other manganese oxides are common associates
(HOM).
Localities
At Roughton Gill Mine, Roughton Gill, Caldbeck, Allerdale, Cumbria, England, UK, coronadite has been found with
mimetite
(Mindat photo).
Coronadite from Roughton Gill Mine - Image
The type locality is the Horse-Shoe shaft, Coronado Mine, Coronado vein, Copper Plate Gulch, Greenlee County, Arizona, USA.
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