Mammilary Formations of Psilomelane
Collection
John Betts - Fine Minerals
Description
Mammilary formations of iridescent brown-black Psilomelane (mixture of oxides of manganese composed of Romanechite, Hollandite, Cryptomelane, etc.).
Locality
Ironwood District, Gogebic County, Michigan
Dimensions
7 x 4 x 2.5 cm.
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