Vote for your favorite mineral in #MinCup26! - Erythrite vs. Skutterudite
Pretty pink and poisonous Erythrite is against its shiny silver and structurally-useful Skutterudite.
Log InRegister
Quick Links : The Mindat ManualThe Rock H. Currier Digital LibraryMindat Newsletter [Free Download]
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat ArticlesThe ElementsThe Rock H. Currier Digital LibraryGeologic TimeExplore Fossils
Minerals by PropertiesMinerals by ChemistryMineral Visual ExplorerAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsUsersMineral MuseumsClubs & OrganizationsMineral Shows & EventsThe Mindat DirectoryDevice SettingsThe Mineral QuizTime Machine
Photo SearchPhoto GalleriesSearch by ColorPhoto Colour ExplorerNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryPhotography

Stepstone Prospect, Nespelem Mining District, Okanogan County, Washington, USAi
Regional Level Types
Stepstone ProspectProspect
Nespelem Mining DistrictMining District
Okanogan CountyCounty
WashingtonState
USACountry

This page is currently not sponsored. Click here to sponsor this page.
PhotosMapsSearchMineralogy
Latitude & Longitude (WGS84):
48° 18' 26'' North , 118° 57' 47'' West
Latitude & Longitude (decimal):
48.30731,-118.96331
GRN:
N33W57
Type:
Prospect
Köppen climate type:
Dsb : Warm, dry-summer continental climate
Nearest Settlements:
PlacePopulationDistance
Nespelem256 (2017)15.6km
Nespelem Community253 (2011)15.8km
Keller234 (2011)32.7km
Elmer City240 (2017)34.4km
Coulee Dam1,093 (2017)38.0km
Mindat Locality ID:
17281
Long-form identifier:
mindat:1:2:17281:4
GUID (UUID V4):
0
Other/historical names associated with this locality:
Cabin Prospect; Idell Prospect


A nickel-chromium prospect near Stepstone Creek. It worked a 6' bed of limestone and a 15' body of serpentine enclosed in quartzite and argillite. Quartz lenses 1-12" wide in limestone are mineralized. Development includes a 60' shaft, a 35' shaft, and an open cut.


Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


10 valid minerals.

Detailed Mineral List:

ⓘ Annabergite
Formula: Ni3(AsO4)2 · 8H2O
Habit: crusts
Colour: bright green
ⓘ Antigorite
Formula: Mg3(Si2O5)(OH)4
ⓘ Chromite
Formula: Fe2+Cr3+2O4
ⓘ Erythrite
Formula: Co3(AsO4)2 · 8H2O
Habit: crusts
Colour: pink
ⓘ 'Limonite'
ⓘ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
ⓘ Muscovite var. Fuchsite
Formula: K(Al,Cr)3Si3O10(OH)2
ⓘ Pentlandite
Formula: (NixFey)Σ9S8
ⓘ Pyrite
Formula: FeS2
ⓘ Pyrrhotite
Formula: Fe1-xS
ⓘ Quartz
Formula: SiO2
ⓘ 'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4
ⓘ Zaratite
Formula: Ni3(CO3)(OH)4 · 4H2O ?

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘPentlandite2.BB.15(NixFey)Σ9S8
ⓘPyrrhotite2.CC.10Fe1-xS
ⓘPyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
ⓘChromite4.BB.05Fe2+Cr3+2O4
ⓘQuartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
ⓘZaratite5.DA.15Ni3(CO3)(OH)4 · 4H2O ?
Group 8 - Phosphates, Arsenates and Vanadates
ⓘAnnabergite8.CE.40Ni3(AsO4)2 · 8H2O
ⓘErythrite8.CE.40Co3(AsO4)2 · 8H2O
Group 9 - Silicates
ⓘMuscovite
var. Fuchsite		9.EC.15K(Al,Cr)3Si3O10(OH)2
ⓘ9.EC.15KAl2(AlSi3O10)(OH)2
ⓘAntigorite9.ED.15Mg3(Si2O5)(OH)4
Unclassified
ⓘ'Limonite'-
ⓘ'Serpentine Subgroup'-D3[Si2O5](OH)4

List of minerals for each chemical element

HHydrogen
Hⓘ AnnabergiteNi3(AsO4)2 · 8H2O
Hⓘ AntigoriteMg3(Si2O5)(OH)4
Hⓘ ErythriteCo3(AsO4)2 · 8H2O
Hⓘ Muscovite var. FuchsiteK(Al,Cr)3Si3O10(OH)2
Hⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Hⓘ ZaratiteNi3(CO3)(OH)4 · 4H2O ?
Hⓘ Serpentine SubgroupD3[Si2O5](OH)4
CCarbon
Cⓘ ZaratiteNi3(CO3)(OH)4 · 4H2O ?
OOxygen
Oⓘ AnnabergiteNi3(AsO4)2 · 8H2O
Oⓘ AntigoriteMg3(Si2O5)(OH)4
Oⓘ ChromiteFe2+Cr23+O4
Oⓘ ErythriteCo3(AsO4)2 · 8H2O
Oⓘ Muscovite var. FuchsiteK(Al,Cr)3Si3O10(OH)2
Oⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Oⓘ QuartzSiO2
Oⓘ ZaratiteNi3(CO3)(OH)4 · 4H2O ?
Oⓘ Serpentine SubgroupD3[Si2O5](OH)4
MgMagnesium
Mgⓘ AntigoriteMg3(Si2O5)(OH)4
AlAluminium
Alⓘ Muscovite var. FuchsiteK(Al,Cr)3Si3O10(OH)2
Alⓘ MuscoviteKAl2(AlSi3O10)(OH)2
SiSilicon
Siⓘ AntigoriteMg3(Si2O5)(OH)4
Siⓘ Muscovite var. FuchsiteK(Al,Cr)3Si3O10(OH)2
Siⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Siⓘ QuartzSiO2
Siⓘ Serpentine SubgroupD3[Si2O5](OH)4
SSulfur
Sⓘ Pentlandite(NixFey)Σ9S8
Sⓘ PyriteFeS2
Sⓘ PyrrhotiteFe1-xS
KPotassium
Kⓘ Muscovite var. FuchsiteK(Al,Cr)3Si3O10(OH)2
Kⓘ MuscoviteKAl2(AlSi3O10)(OH)2
CrChromium
Crⓘ ChromiteFe2+Cr23+O4
Crⓘ Muscovite var. FuchsiteK(Al,Cr)3Si3O10(OH)2
FeIron
Feⓘ ChromiteFe2+Cr23+O4
Feⓘ Pentlandite(NixFey)Σ9S8
Feⓘ PyriteFeS2
Feⓘ PyrrhotiteFe1-xS
CoCobalt
Coⓘ ErythriteCo3(AsO4)2 · 8H2O
NiNickel
Niⓘ AnnabergiteNi3(AsO4)2 · 8H2O
Niⓘ Pentlandite(NixFey)Σ9S8
Niⓘ ZaratiteNi3(CO3)(OH)4 · 4H2O ?
AsArsenic
Asⓘ AnnabergiteNi3(AsO4)2 · 8H2O
Asⓘ ErythriteCo3(AsO4)2 · 8H2O

Other Databases

Link to USGS MRDS:10277608

Other Regions, Features and Areas containing this locality

North AmericaContinent
North America PlateTectonic Plate
USA

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Pardee, J. T. (1918) Geology and mineral deposits of the Colville Indian Reservation, Washington. Bulletin 677. US Geological Survey doi:10.3133/b677
Valentine, Grant M., Huntting, Marshall T. (1960) Part II - Metallic Minerals, in Inventory of Washington Minerals. Vol II. Bulletin 37, Washington Geological Survey.
Staatz, M. (1964): Geology of the Bald Knob quadrangle, Ferry and Okanogan Counties, Washington: U.S. Geological Survey. Bulletin 1161-F
Cannon, Bart (1975) Minerals of Washington. Cordilleran. 184 pp.
Quick NavTopCommoditiesMineral ListOther DatabasesOther RegionsReferences
 
and/or  
Mindat.org® is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Mindat® and mindat.org® are registered trademarks of the Hudson Institute of Mineralogy.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2026, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph and Ida Chau.
Content on this site may not be used to train, fine-tune, or otherwise develop artificial intelligence or machine learning models without prior written permission - see our Terms & Conditions.
To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: September 2, 2026 19:46:44 Page updated: July 23, 2026 19:59:40
Go to top of page