AllMinerals/JohnBetts-FineMinerals > Online Mineral Museum Photographic Archive > Minerals from Michigan > Psilomelane (romanèchite+hollandite+cryptomelane)

Psilomelane (romanèchite+hollandite+cryptomelane) from Ironwood District, Gogebic County, Michigan

DESCRIPTION:	No. 80477
Mineral:	Psilomelane (romanèchite+hollandite+cryptomelane)
Locality:	Ironwood District, Gogebic County, Michigan
Description:	Mammilary formations to 12 mm of black psilomelane (mixture of oxides of manganese composed of romanèchite, hollandite, cryptomelane, etc.). The surfaces of the psilomelane have high luster in areas, and show no polishing marks under magnification. Ex. Miller #M3907
Overall Size:	6x4.5x4 cm
Crystals:	1-3 mm
Archived:	For reference only

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