Pyrolusite from Silver Bow County, Montana, USA

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USA
Montana Silver Bow County Butte Mining District (Summit Valley Mining District) ⓘ Independence Mine	Multiple specimens field collected by Daniel Evanich
ⓘ Iowa Mine	(2005) Mineral Resources Data System (MRDS), US Geological Survey. Weed, W.H. (1912) Geology and ore deposits of the Butte district, Montana. Professional Paper 74. US Geological Survey doi:10.3133/pp74
ⓘ Kossuth Mine	Weed, W.H. (1912) Geology and ore deposits of the Butte district, Montana. Professional Paper 74. US Geological Survey doi:10.3133/pp74
ⓘ Mapleton Mine	Analyzed using EDS and XRD single crystal analysis methods at University of Arizona 2023 br Dr. Hexiong Yang. SEM/EDS and XRD single crystal analysis confirmed at University of Arizona by Dr. Hexiong Yang 2023 SEM/EDS and XRD single crystal analysis confirmed at University of Arizona by Dr. Hexiong Yang 2023 SEM/EDS and XRD single crystal analysis confirmed at University of Arizona by Dr. Hexiong Yang 2023
ⓘ Sankey Mine	(2005) Mineral Resources Data System (MRDS), US Geological Survey. Weed, W.H. (1912) Geology and ore deposits of the Butte district, Montana. Professional Paper 74. US Geological Survey doi:10.3133/pp74
ⓘ Star West Mine	(2005) Mineral Resources Data System (MRDS), US Geological Survey.
ⓘ Tzarina Mine	(2005) Mineral Resources Data System (MRDS), US Geological Survey.