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Washington Co., Idaho, USA

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Detailed Mineral List:
Acanthite
Formula: Ag2S
Locality: Ruthberg District, Washington Co., Idaho, USA
Actinolite
Formula: ☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Localities: Climax Prospect (Bownlee Creek Deposit), Cuddy Mountain District, Washington Co., Idaho, USA
Iron Prospect (MRDS - 10070206), Cuddy Mountain District, Washington Co., Idaho, USA
Railroad Mine (Held Mine), Cuddy Mountain District, Washington Co., Idaho, USA
Skarn Prospect, Sturgill Peak Area, Washington Co., Idaho, USA
Analcime
Formula: Na2(Al2Si4O12) · 2H2O
Locality: Highway 95 Roadcuts, Middle Fork of Weiser River, Washington Co., Idaho, USA
'Andradite-Grossular Series'
Localities: Mortimer Prospect (Iron Mountain Mining Company; Siegwein/Standard; Abundance; Montana; Campbell), Iron Mountain District, Washington Co., Idaho, USA
Standard Specularite Prospect (Siegwein), Iron Mountain District, Washington Co., Idaho, USA
Iron Mountain District, Washington Co., Idaho, USA
Montana Prospect, Iron Mountain District, Washington Co., Idaho, USA
Photo: Andradite-Grossular Series from Mortimer Prospect, Iron Mountain District, Washington Co., Idaho, USA
Anglesite
Formula: PbSO4
Locality: Lead Zone Mine (Keystone and Galena), Cuddy Mountain District, Washington Co., Idaho, USA
'Apophyllite'
Locality: Highway 95 Roadcuts, Middle Fork of Weiser River, Washington Co., Idaho, USA
Augite
Formula: (Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
Locality: East Brownlee Creek Prospect Pits, Cuddy Mountain District, Washington Co., Idaho, USA
Baryte
Formula: BaSO4
Localities: Eagan Mine (Egan), Mineral Hill District, Washington Co., Idaho, USA
Iron Prospect (MRDS - 10070206), Cuddy Mountain District, Washington Co., Idaho, USA
IXL Mine (Red Ledge), Cuddy Mountain District, Washington Co., Idaho, USA
Beidellite
Formula: (Na,Ca0.5)0.3Al2((Si,Al)4O10)(OH)2 · nH2O
Locality: Idaho Almaden Mine (Nutmeg; U.S.A. Anna; Almaden; Almaden Project), Weiser District, Washington Co., Idaho, USA
'Biotite'
Localities: Diatomite Mine (MRDS - 10070229), Weiser, Washington Co., Idaho, USA
Diatomite Occurrence (MRDS - 10093747), Weiser District, Washington Co., Idaho, USA
IXL Mine (Red Ledge), Cuddy Mountain District, Washington Co., Idaho, USA
Bismuth
Formula: Bi
Locality: Railroad Mine (Held Mine), Cuddy Mountain District, Washington Co., Idaho, USA
Bornite
Formula: Cu5FeS4
Localities: IXL Mine (Red Ledge), Cuddy Mountain District, Washington Co., Idaho, USA
Railroad Mine (Held Mine), Cuddy Mountain District, Washington Co., Idaho, USA
Boulangerite
Formula: Pb5Sb4S11
Locality: Silver Still Mine (North Star Property), Mineral Hill District, Washington Co., Idaho, USA
Bournonite
Formula: PbCuSbS3
Locality: Silver Still Mine (North Star Property), Mineral Hill District, Washington Co., Idaho, USA
Calcite
Formula: CaCO3
Localities: Reported from at least 15 localities in this region.
Cerussite
Formula: PbCO3
Locality: Ruthberg District, Washington Co., Idaho, USA
'Chabazite'
Locality: Highway 95 Roadcuts, Middle Fork of Weiser River, Washington Co., Idaho, USA
Chalcopyrite
Formula: CuFeS2
Localities: Reported from at least 32 localities in this region.
Chamosite
Formula: (Fe2+,Mg)5Al(AlSi3O10)(OH)8
Locality: Iron Mountain District, Washington Co., Idaho, USA
Chlorargyrite
Formula: AgCl
Locality: Ruthberg District, Washington Co., Idaho, USA
'Chlorite Group'
Localities: Handy Mine (Columbine Gypsum; Rock Creek), Mineral Mountain Area, Washington Co., Idaho, USA
Unnamed pit, Iron Mountain, Washington Co., Idaho, USA
Chrysocolla
Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O (x < 1)
Localities: Grade Creek Prospect, Cuddy Mountain District, Washington Co., Idaho, USA
Little Bar, Snake River, Washington Co., Idaho, USA
Climax Prospect (Bownlee Creek Deposit), Cuddy Mountain District, Washington Co., Idaho, USA
East Brownlee Creek Prospect Pits, Cuddy Mountain District, Washington Co., Idaho, USA
Cinnabar
Formula: HgS
Localities: Reported from at least 9 localities in this region.
Photo: © Rob Lavinsky. Cinnabar from Weiser District, Washington Co., Idaho, USA
'Clay'
Localities: Diatomite Mine (MRDS - 10070229), Weiser, Washington Co., Idaho, USA
Diatomite Occurrence (MRDS - 10078450), Monroe District, Washington Co., Idaho, USA
Diatomite Occurrence, Weiser, Washington Co., Idaho, USA
Cuprite
Formula: Cu2O
Locality: Little Bar, Snake River, Washington Co., Idaho, USA
Dravite
Formula: Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
Locality: Unnamed pit, Iron Mountain, Washington Co., Idaho, USA
Enargite
Formula: Cu3AsS4
Locality: Silver Still Mine (North Star Property), Mineral Hill District, Washington Co., Idaho, USA
Epidote
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Localities: Four V Prospect, Cuddy Mountain District, Washington Co., Idaho, USA
Gabbro Prospect, Sturgill Peak Area, Washington Co., Idaho, USA
Goodrich Creek Canyon Prospect, Cuddy Mountain District, Washington Co., Idaho, USA
Railroad Mine (Held Mine), Cuddy Mountain District, Washington Co., Idaho, USA
Skarn Prospect, Sturgill Peak Area, Washington Co., Idaho, USA
Galena
Formula: PbS
Localities: Reported from at least 14 localities in this region.
'Garnet'
Formula: X3Z2(SiO4)3
Localities: Climax Prospect (Bownlee Creek Deposit), Cuddy Mountain District, Washington Co., Idaho, USA
Skarn Prospect, Sturgill Peak Area, Washington Co., Idaho, USA
East Brownlee Creek Prospect Pits, Cuddy Mountain District, Washington Co., Idaho, USA
Photo: © Alan Goldstein. Garnet from Iron Mountain District, Washington Co., Idaho, USA
Goethite
Formula: α-Fe3+O(OH)
Locality: Thorn Spring Prospect, Mineral Hill District, Washington Co., Idaho, USA
Gold
Formula: Au
Localities: Con Dor Mine (Condor; Jessie), Mineral Hill District, Washington Co., Idaho, USA
Cuddy Mine, Cuddy Mountain District, Washington Co., Idaho, USA
Freeze Prospect, Cuddy Mountain District, Washington Co., Idaho, USA
Gold Prospect (MRDS - 10070088), Sturgill Peak Area, Washington Co., Idaho, USA
Sturgill Creek Placer, Sturgill Creek Area, Washington Co., Idaho, USA
Grossular
Formula: Ca3Al2(SiO4)3
Locality: Unnamed pit, Iron Mountain, Washington Co., Idaho, USA
Photo: © JSS. Grossular from Iron Mountain District, Washington Co., Idaho, USA
Gypsum
Formula: CaSO4 · 2H2O
Localities: Midvale, Washington Co., Idaho, USA
Highway 95, Weiser, Washington Co., Idaho, USA
Bell Mine (Silver Bell), Mineral Hill District, Washington Co., Idaho, USA
Gypsum Mine (MRDS - 10079113), Mineral Hill District, Washington Co., Idaho, USA
Handy Mine (Columbine Gypsum; Rock Creek), Mineral Mountain Area, Washington Co., Idaho, USA
Photo: © BT. Gypsum from Highway 95, Weiser, Washington Co., Idaho, USA
'Halloysite'
Formula: Al2(Si2O5)(OH)4
Locality: Idaho Almaden Mine (Nutmeg; U.S.A. Anna; Almaden; Almaden Project), Weiser District, Washington Co., Idaho, USA
Hematite
Formula: Fe2O3
Localities: Reported from at least 7 localities in this region.
Hematite var: Specularite
Locality: Standard Specularite Prospect (Siegwein), Iron Mountain District, Washington Co., Idaho, USA
Jarosite
Formula: KFe3+ 3(SO4)2(OH)6
Locality: Thorn Spring Prospect, Mineral Hill District, Washington Co., Idaho, USA
Kaolinite
Formula: Al2(Si2O5)(OH)4
Localities: Goodrich Creek Canyon Prospect, Cuddy Mountain District, Washington Co., Idaho, USA
Idaho Almaden Mine (Nutmeg; U.S.A. Anna; Almaden; Almaden Project), Weiser District, Washington Co., Idaho, USA
'K Feldspar'
Locality: Edna May Prospect (Mundee Mines?; Snowslide Prospect; Lavender), Brownlee Dam Area, Washington Co., Idaho, USA
'Limonite'
Formula: FeO(OH) · nH2O
Localities: Campbell Magnetite Deposit Prospect (W. J. Bryan; Campbell Deposit; Siegwein Claims; Barton; Last Chance), Iron Mountain District, Washington Co., Idaho, USA
Gold Prospect (MRDS - 10070088), Sturgill Peak Area, Washington Co., Idaho, USA
Iron Prospect (MRDS - 10070206), Cuddy Mountain District, Washington Co., Idaho, USA
Montana Prospect, Iron Mountain District, Washington Co., Idaho, USA
Idaho Almaden Mine (Nutmeg; U.S.A. Anna; Almaden; Almaden Project), Weiser District, Washington Co., Idaho, USA
Magnetite
Formula: Fe2+Fe3+2O4
Localities: Reported from at least 11 localities in this region.
Malachite
Formula: Cu2(CO3)(OH)2
Localities: Reported from at least 10 localities in this region.
Marcasite
Formula: FeS2
Localities: Bell Mine (Silver Bell), Mineral Hill District, Washington Co., Idaho, USA
IXL Mine (Red Ledge), Cuddy Mountain District, Washington Co., Idaho, USA
Mariah Mine (Maria; Black Maria), Mineral Hill District, Washington Co., Idaho, USA
Silver Still Mine (North Star Property), Mineral Hill District, Washington Co., Idaho, USA
Mesolite
Formula: Na2Ca2Si9Al6O30 · 8H2O
Locality: Highway 95 Roadcuts, Middle Fork of Weiser River, Washington Co., Idaho, USA
'Mica Group'
Locality: Diatomite Occurrence, Weiser, Washington Co., Idaho, USA
Molybdenite
Formula: MoS2
Localities: IXL Mine (Red Ledge), Cuddy Mountain District, Washington Co., Idaho, USA
Kismet Prospect, Cuddy Mountain District, Washington Co., Idaho, USA
Muscovite var: Sericite
Locality: Goodrich Creek Canyon Prospect, Cuddy Mountain District, Washington Co., Idaho, USA
Opal
Formula: SiO2 · nH2O
Localities: Idaho Almaden Mine (Nutmeg; U.S.A. Anna; Almaden; Almaden Project), Weiser District, Washington Co., Idaho, USA
Helen Zucker Prospect (Zucker Property; Parker Group), Weiser District, Washington Co., Idaho, USA
Virginia L. Claims (Raft Creek Cinnabar; Lackey Mine), Weiser District, Washington Co., Idaho, USA
Opal var: Diatomite
Localities: Diatomite Mine (MRDS - 10070229), Weiser, Washington Co., Idaho, USA
Diatomite Occurrence (MRDS - 10078450), Monroe District, Washington Co., Idaho, USA
Diatomite Occurrence (MRDS - 10093747), Weiser District, Washington Co., Idaho, USA
Diatomite Occurrence, Weiser, Washington Co., Idaho, USA
Orthoclase
Formula: KAlSi3O8
Locality: Gabbro Prospect, Sturgill Peak Area, Washington Co., Idaho, USA
'Phillipsite'
Locality: Highway 95 Roadcuts, Middle Fork of Weiser River, Washington Co., Idaho, USA
Phlogopite
Formula: KMg3(AlSi3O10)(OH,F)2
Locality: Unnamed pit, Iron Mountain, Washington Co., Idaho, USA
Photo: © JSS. Phlogopite from Iron Mountain District, Washington Co., Idaho, USA
Pyrite
Formula: FeS2
Localities: Reported from at least 33 localities in this region.
Pyrolusite
Formula: MnO2
Localities: Brownlee Manganese Prospect, Unorganized District, Cambridge Area, Washington Co., Idaho, USA
Sturgill Creek Mine (Adams), Sturgill Creek Area, Washington Co., Idaho, USA
Pyrrhotite
Formula: Fe1-xS (x = 0 to 0.17)
Localities: IXL Mine (Red Ledge), Cuddy Mountain District, Washington Co., Idaho, USA
Kismet Prospect, Cuddy Mountain District, Washington Co., Idaho, USA
Quartz
Formula: SiO2
Localities: Reported from at least 40 localities in this region.
Photo: © Don Volkman 2/24/08. Quartz from Beacon Hill, Washington Co., Idaho, USA
Quartz var: Agate
Formula: SiO2
Localities: Weiser, Washington Co., Idaho, USA
Beacon Hill, Washington Co., Idaho, USA
Photo: © Don Volkman 2/7/08. Agate from Beacon Hill, Washington Co., Idaho, USA
Quartz var: Amethyst
Formula: SiO2
Localities: Hog Creek area, Washington Co., Idaho, USA
Beacon Hill, Washington Co., Idaho, USA
Quartz var: Chalcedony
Localities: Idaho Almaden Mine (Nutmeg; U.S.A. Anna; Almaden; Almaden Project), Weiser District, Washington Co., Idaho, USA
John Coats Prospect (Coats), Weiser District, Washington Co., Idaho, USA
Beacon Hill, Washington Co., Idaho, USA
Quartz var: Jasper
Localities: Snake River, Washington Co., Idaho, USA
Standard Specularite Prospect (Siegwein), Iron Mountain District, Washington Co., Idaho, USA
Sturgill Creek Mine (Adams), Sturgill Creek Area, Washington Co., Idaho, USA
'Scapolite'
Locality: Skarn Prospect, Sturgill Peak Area, Washington Co., Idaho, USA
Siderite
Formula: FeCO3
Locality: Eagan Mine (Egan), Mineral Hill District, Washington Co., Idaho, USA
Silver
Formula: Ag
Locality: Ruthberg District, Washington Co., Idaho, USA
Sphalerite
Formula: ZnS
Localities: Reported from at least 16 localities in this region.
Stannite
Formula: Cu2(Fe,Zn)SnS4
Locality: Silver Still Mine (North Star Property), Mineral Hill District, Washington Co., Idaho, USA
Tetrahedrite
Formula: Cu6[Cu4(Fe,Zn)2]Sb4S13
Localities: Reported from at least 10 localities in this region.
Thomsonite-Ca
Formula: NaCa2[Al5Si5O20] · 6H2O
Locality: Highway 95 Roadcuts, Middle Fork of Weiser River, Washington Co., Idaho, USA
'Tourmaline'
Formula: A(D3)G6(T6O18)(BO3)3X3Z
Localities: Reported from at least 9 localities in this region.
Tremolite
Formula: ☐{Ca2}{Mg5}(Si8O22)(OH)2
Localities: Iron Prospect (MRDS - 10070206), Cuddy Mountain District, Washington Co., Idaho, USA
Railroad Mine (Held Mine), Cuddy Mountain District, Washington Co., Idaho, USA
Wurtzite
Formula: (Zn,Fe)S
Localities: Black Hawk Mine, Mineral Hill District, Washington Co., Idaho, USA
Mariah Mine (Maria; Black Maria), Mineral Hill District, Washington Co., Idaho, USA
Silver Still Mine (North Star Property), Mineral Hill District, Washington Co., Idaho, USA


71 entries listed. 50 valid minerals.
Mineral and/or Locality  
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