| Almandine | |
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| Formula: | Fe2+3Al2(SiO4)3 |
| Reference: | R&M 75:3 pp 156-169 |
| Localities: | Recorded from at least 1 other locality in this region. |
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| Ankerite | |
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| Formula: | Ca(Fe2+ ,Mg,Mn2+)(CO3)2 |
| Reference: | R&M 75:3 pp 156-169 |
| Localities: | Recorded from at least 3 other localities in this region. |
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| Arsenopyrite | |
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| Formula: | FeAsS |
| Reference: | R&M 75:3 pp 156-169 |
| Localities: | Recorded from at least 6 other localities in this region. |
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| Biotite | |
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| Reference: | USGS Prof Paper 610 "Principal Gold Producing Districts of the United States" |
| Localities: | Recorded from at least 2 other localities in this region. |
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| Bismite | |
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| Formula: | Bi2O3 |
| Locality: | Cobalt lode (Margaret Tin Mine), Keystone Gold District, Pennington Co., South Dakota, USA |
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| Bismuth | |
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| Formula: | Bi |
| Locality: | Cobalt lode (Margaret Tin Mine), Keystone Gold District, Pennington Co., South Dakota, USA |
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| Bismuthinite | |
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| Formula: | Bi2S3 |
| Locality: | Cobalt lode (Margaret Tin Mine), Keystone Gold District, Pennington Co., South Dakota, USA |
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| Calcite | |
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| Formula: | CaCO3 |
| Locality: | Columbia Mine (Maiden Mine), Keystone, Keystone Gold District, Pennington Co., South Dakota, USA |
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| Chalcopyrite | |
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| Formula: | CuFeS2 |
| Reference: | USGS Prof Paper 610 "Principal Gold Producing Districts of the United States" |
| Localities: | Recorded from at least 4 other localities in this region. |
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| 'Chlorite Group' | |
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| Reference: | USGS Prof Paper 610 "Principal Gold Producing Districts of the United States" |
| Localities: | Recorded from at least 2 other localities in this region. |
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| Cummingtonite | |
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| Formula: | ☐{Mg2}{Mg5}(Si8O22)(OH)2 |
| Locality: | Bullion-Columbia Mine, Keystone Gold District, Pennington Co., South Dakota, USA |
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| Diadochite | |
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| Formula: | Fe3+2(PO4)(SO4)(OH) · 5H2O |
| Locality: | Legal Tender Group, Keystone Gold District, Pennington Co., South Dakota, USA |
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| Diopside | |
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| Formula: | CaMgSi2O6 |
| Localities: | Bullion Formation, Keystone Gold District, Pennington Co., South Dakota, USA
Etta Formation, Keystone Gold District, Pennington Co., South Dakota, USA
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| Epsomite | |
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| Formula: | MgSO4 · 7H2O |
| Locality: | Nathaniel Pope, Keystone Gold District, Pennington Co., South Dakota, USA |
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| 'Feldspar Group' | |
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| Locality: | Bullion Formation, Keystone Gold District, Pennington Co., South Dakota, USA |
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| 'Garnet Group' | |
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| Formula: | X3Z2(TO4)3 (X = Ca, Fe, etc · , Z = Al, Cr, etc · , T = Si, As, V, etc · ) |
| Reference: | USGS Prof Paper 610 "Principal Gold Producing Districts of the United States" |
| Localities: | Recorded from at least 1 other locality in this region. |
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| Gold | |
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| Formula: | Au |
| Reference: | R&M 75:3 pp 156-169 |
| Localities: | Recorded from at least 13 other localities in this region. |
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| Graphite | |
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| Formula: | C |
| Reference: | USGS Prof Paper 610 "Principal Gold Producing Districts of the United States" |
| Localities: | Recorded from at least 3 other localities in this region. |
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| Hedenbergite | |
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| Formula: | CaFe2+Si2O6 |
| Locality: | Bullion Formation, Keystone Gold District, Pennington Co., South Dakota, USA |
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| 'Hornblende' | |
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| Reference: | USGS Prof Paper 610 "Principal Gold Producing Districts of the United States" |
| Localities: | Recorded from at least 6 other localities in this region. |
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| Magnesite | |
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| Formula: | MgCO3 |
| Locality: | Bismark-Ida Florence Groups, Keystone Gold District, Pennington Co., South Dakota, USA |
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| Muscovite | |
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| Formula: | KAl2(AlSi3O10)(OH)2 |
| Reference: | R&M 75:3 pp 156-169 |
| Localities: | Recorded from at least 3 other localities in this region. |
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| Pickeringite | |
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| Formula: | MgAl2(SO4)4 · 22H2O |
| Localities: | Holy Terror Mine, Keystone Gold District, Pennington Co., South Dakota, USA
Keystone Mine, Keystone Gold District, Pennington Co., South Dakota, USA
Bullion-Columbia Mine, Keystone Gold District, Pennington Co., South Dakota, USA
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| Pyrite | |
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| Formula: | FeS2 |
| Localities: | Holy Terror Mine, Keystone Gold District, Pennington Co., South Dakota, USA
Bismark-Ida Florence Groups, Keystone Gold District, Pennington Co., South Dakota, USA
Grand Island Group, Keystone Gold District, Pennington Co., South Dakota, USA
Juniper Mine, Keystone Gold District, Pennington Co., South Dakota, USA
Legal Tender Group, Keystone Gold District, Pennington Co., South Dakota, USA
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| Pyrrhotite | |
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| Formula: | Fe1-xS (x = 0 to 0.17) |
| Reference: | USGS Prof Paper 610 "Principal Gold Producing Districts of the United States" |
| Localities: | Recorded from at least 6 other localities in this region. |
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| Quartz | |
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| Formula: | SiO2 |
| Reference: | R&M 75:3 pp 156-169 |
| Localities: | Recorded from at least 11 other localities in this region. |
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| Schorl | |
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| Formula: | Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH) |
| Locality: | Holy Terror Mine, Keystone Gold District, Pennington Co., South Dakota, USA |
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| Siderite | |
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| Formula: | FeCO3 |
| Locality: | Bismark-Ida Florence Groups, Keystone Gold District, Pennington Co., South Dakota, USA |
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| Silver | |
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| Formula: | Ag |
| Localities: | Recorded from at least 11 localities in this region. |
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| Sphalerite | |
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| Formula: | ZnS |
| Reference: | USGS Prof Paper 610 "Principal Gold Producing Districts of the United States" |
| Localities: | Recorded from at least 4 other localities in this region. |
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| Staurolite | |
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| Formula: | (Fe2+,Mg,Zn)1.5-2Al9(SiO4)4O6(OH,O)2 |
| Locality: | Holy Terror Mine, Keystone Gold District, Pennington Co., South Dakota, USA |
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| Titanite | |
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| Formula: | CaTi(SiO4)O |
| Localities: | Etta Formation, Keystone Gold District, Pennington Co., South Dakota, USA
Bullion Formation, Keystone Gold District, Pennington Co., South Dakota, USA
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| Triplite | |
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| Formula: | (Mn2+,Fe2+)2(PO4)(F,OH) |
| Locality: | Cobalt lode (Margaret Tin Mine), Keystone Gold District, Pennington Co., South Dakota, USA |
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| Zoisite | |
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| Formula: | {Ca2}{Al3}(Si2O7)(SiO4)O(OH) |
| Localities: | Bullion Formation, Keystone Gold District, Pennington Co., South Dakota, USA
Etta Formation, Keystone Gold District, Pennington Co., South Dakota, USA
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34 entries listed. 29 valid minerals.
Mineral and Locality Search
