Vote for your favorite mineral in #MinCup26! - Bournonite vs. Vesuvianite
Cogwheels of bournonite are up against colourful vesuvianite.
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

Custer State Park, Custer County, South Dakota, USAi
Regional Level Types
Custer State ParkState Park
Custer CountyCounty
South DakotaState
USACountry

This page is currently not sponsored. Click here to sponsor this page.
PhotosSearchMineralogy
05082610017272728302143.jpg
Custer State Park, Black Hills, South Dakota.

Custer State Park, Custer County, South Dakota, USA
Mindat Locality ID:
303633
Long-form identifier:
mindat:1:2:303633:7
GUID (UUID V4):
0


Custer State Park is a “must see” for any visitor to the Black Hills. It is a jewel of Black Hills scenery, however, collecting is not allowed. In the old days prior to the “no collecting” rule, local collectors would remove agates from a limestone outcrop that is now in the park. In fact June Culp Zeitner once wrote a small rockhound guide that gave the location. They are called “State Park Agates” and sometimes show up in old collections.

There are two scenic roads in the park, the Wildlife Loop Road and the Needles Highway. The Wildlife Loop is unfenced and gives access to rolling prairie hills and buffalo herds. The Needles Highway (No. 87) passes through granite/pegmatite spires to Sylvan Lake the trail head for a hike up Black Elk Peak. In 1927 the State Game Lodge was the summer White House for President Coolidge and is still in service today.

The agates shown here were collected prior to the early 1960’s before the prohibition of collecting in Custer State Park. Like Teepee Canyon, the documentation of this in-situ location of banded agates in the limestone formations that encircle the Hills provides valuable information on the source of Fairburn Agates that abound in the alluvial gravels that are strewn through the grasslands and badlands southeast of the Black Hills.
71,000-acre wildlife preserve

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded from this region.


Mineral List

Mineral list contains entries from the region specified including sub-localities

55 valid minerals.

Rock Types Recorded


Rock list contains entries from the region specified including sub-localities

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Actinolite
Formula: ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Albite
Formula: Na(AlSi3O8)
Albite var. Cleavelandite
Formula: Na(AlSi3O8)
'Allanite Group'
Formula: (A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH)
Almandine
Formula: Fe2+3Al2(SiO4)3
Habit: trapezohedral
Colour: maroon
Description: Relatively rare accessory in the abundant granite/pegmatite within the park.
Amblygonite
Formula: LiAl(PO4)F
Andalusite
Formula: Al2(SiO4)O
Anhydrite
Formula: CaSO4
Arsenolite
Formula: As2O3
Arsenopyrite
Formula: FeAsS
Autunite
Formula: Ca(UO2)2(PO4)2 · 10-12H2O
Azurite
Formula: Cu3(CO3)2(OH)2
Beryl
Formula: Be3Al2(Si6O18)
'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Calcite
Formula: CaCO3
Cassiterite
Formula: SnO2
Chalcopyrite
Formula: CuFeS2
'Chlorite Group'
'Clinoptilolite Subgroup'
Formula: (Na/Ca/K)3-6[Al6-7Si29-30O72] · 20H2O
'Columbite-(Fe)-Columbite-(Mn) Series'
Cuprite
Formula: Cu2O
Diopside
Formula: CaMgSi2O6
Dolomite
Formula: CaMg(CO3)2
Fluorapatite
Formula: Ca5(PO4)3F
Fluorescence: Orange in SW
Description: Manganese rich
Fluorite
Formula: CaF2
'Garnet Group'
Formula: X3Z2(SiO4)3
Graphite
Formula: C
Hematite
Formula: Fe2O3
Heterosite
Formula: Fe3+(PO4)
Hureaulite
Formula: Mn2+5(PO3OH)2(PO4)2 · 4H2O
Kyanite
Formula: Al2(SiO4)O
Leucophosphite
Formula: KFe3+2(PO4)2(OH) · 2H2O
Malachite
Formula: Cu2(CO3)(OH)2
Melanterite
Formula: Fe2+(H2O)6(SO4) · H2O
Microcline
Formula: K(AlSi3O8)
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Native Gold
Formula: Au
Opal
Formula: SiO2 · nH2O
Orthoclase
Formula: K(AlSi3O8)
Pargasite
Formula: NaCa2(Mg4Al)(Si6Al2)O22(OH)2
Phlogopite
Formula: KMg3(AlSi3O10)(OH)2
'Plagioclase'
Formula: (Na,Ca)[(Si,Al)AlSi2]O8
Pyrite
Formula: FeS2
Pyrrhotite
Formula: Fe1-xS
Quartz
Formula: SiO2
Localities: Reported from at least 8 localities in this region.
Quartz var. Agate
Formula: SiO2
Quartz var. Amethyst
Formula: SiO2
Quartz var. Chalcedony
Formula: SiO2
Quartz var. Rose Quartz
Formula: SiO2
Rhodochrosite
Formula: MnCO3
Scheelite
Formula: Ca(WO4)
Schorl
Formula: NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
Habit: subhedral elongated prismatic
Colour: black
Description: Relatively common accessory mineral in the abundant granite/pegmatite within the park.
Scorodite
Formula: Fe3+AsO4 · 2H2O
'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4
Siderite
Formula: FeCO3
Sillimanite
Formula: Al2(SiO4)O
Spessartine
Formula: Mn2+3Al2(SiO4)3
Spodumene
Formula: LiAlSi2O6
'Tantalite'
Formula: (Mn,Fe)(Ta,Nb)2O6
'Tapiolite'
Formula: (Fe,Mn)(Ta,Nb)2O6
Tavorite
Formula: LiFe3+(PO4)(OH)
Tenorite
Formula: CuO
Titanite
Formula: CaTiO(SiO4)
Topaz
Formula: Al2(SiO4)(F,OH)2
'Tourmaline'
Formula: AD3G6(T6O18)(BO3)3X3Z
Tremolite
Formula: ◻Ca2Mg5(Si8O22)(OH)2
Uraninite
Formula: UO2
Uranophane
Formula: Ca(UO2)2(SiO3OH)2 · 5H2O
Wollastonite
Formula: Ca3(Si3O9)
Zircon
Formula: Zr(SiO4)
Zoisite ?
Formula: (CaCa)(AlAlAl)O[Si2O7][SiO4](OH)

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Native Gold1.AA.05Au
Graphite1.CB.05aC
Group 2 - Sulphides and Sulfosalts
Chalcopyrite2.CB.10aCuFeS2
Pyrrhotite2.CC.10Fe1-xS
Pyrite2.EB.05aFeS2
Arsenopyrite2.EB.20FeAsS
Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Cuprite4.AA.10Cu2O
Tenorite4.AB.10CuO
Hematite4.CB.05Fe2O3
Arsenolite4.CB.50As2O3
Quartz
var. Agate
4.DA.05SiO2
var. Amethyst4.DA.05SiO2
var. Chalcedony4.DA.05SiO2
4.DA.05SiO2
var. Rose Quartz4.DA.05SiO2
Opal4.DA.10SiO2 · nH2O
Cassiterite4.DB.05SnO2
Uraninite4.DL.05UO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Rhodochrosite5.AB.05MnCO3
Siderite5.AB.05FeCO3
Dolomite5.AB.10CaMg(CO3)2
Azurite5.BA.05Cu3(CO3)2(OH)2
Malachite5.BA.10Cu2(CO3)(OH)2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Anhydrite7.AD.30CaSO4
Melanterite7.CB.35Fe2+(H2O)6(SO4) · H2O
Scheelite7.GA.05Ca(WO4)
Group 8 - Phosphates, Arsenates and Vanadates
Heterosite8.AB.10Fe3+(PO4)
Amblygonite8.BB.05LiAl(PO4)F
Tavorite8.BB.05LiFe3+(PO4)(OH)
Fluorapatite8.BN.05Ca5(PO4)3F
Hureaulite8.CB.10Mn2+5(PO3OH)2(PO4)2 · 4H2O
Scorodite8.CD.10Fe3+AsO4 · 2H2O
Leucophosphite8.DH.10KFe3+2(PO4)2(OH) · 2H2O
Autunite8.EB.05Ca(UO2)2(PO4)2 · 10-12H2O
Group 9 - Silicates
Almandine9.AD.25Fe2+3Al2(SiO4)3
Spessartine9.AD.25Mn2+3Al2(SiO4)3
Zircon9.AD.30Zr(SiO4)
Sillimanite9.AF.05Al2(SiO4)O
Andalusite9.AF.10Al2(SiO4)O
Kyanite9.AF.15Al2(SiO4)O
Topaz9.AF.35Al2(SiO4)(F,OH)2
Titanite9.AG.15CaTiO(SiO4)
Uranophane9.AK.15Ca(UO2)2(SiO3OH)2 · 5H2O
Zoisite ?9.BG.10(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)
Beryl9.CJ.05Be3Al2(Si6O18)
Schorl9.CK.05NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
Diopside9.DA.15CaMgSi2O6
Spodumene9.DA.30LiAlSi2O6
Actinolite9.DE.10◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Tremolite9.DE.10◻Ca2Mg5(Si8O22)(OH)2
Pargasite9.DE.15NaCa2(Mg4Al)(Si6Al2)O22(OH)2
Wollastonite9.DG.05Ca3(Si3O9)
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
Phlogopite9.EC.20KMg3(AlSi3O10)(OH)2
Microcline9.FA.30K(AlSi3O8)
Orthoclase9.FA.30K(AlSi3O8)
Albite9.FA.35Na(AlSi3O8)
var. Cleavelandite9.FA.35Na(AlSi3O8)
Unclassified
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
'Chlorite Group'-
'Clinoptilolite Subgroup'-(Na/Ca/K)3-6[Al6-7Si29-30O72] · 20H2O
'Tantalite'-(Mn,Fe)(Ta,Nb)2O6
'Tapiolite'-(Fe,Mn)(Ta,Nb)2O6
'Tourmaline'-AD3G6(T6O18)(BO3)3X3Z
'Columbite-(Fe)-Columbite-(Mn) Series'-
'Plagioclase'-(Na,Ca)[(Si,Al)AlSi2]O8
'Garnet Group'-X3Z2(SiO4)3
'Serpentine Subgroup'-D3[Si2O5](OH)4
'Allanite Group'-(A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH)

List of minerals for each chemical element

HHydrogen
H Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
H AutuniteCa(UO2)2(PO4)2 · 10-12H2O
H AzuriteCu3(CO3)2(OH)2
H BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
H Clinoptilolite Subgroup(Na/Ca/K)3-6[Al6-7Si29-30O72] · 20H2O
H HureauliteMn52+(PO3OH)2(PO4)2 · 4H2O
H LeucophosphiteKFe23+(PO4)2(OH) · 2H2O
H MalachiteCu2(CO3)(OH)2
H MelanteriteFe2+(H2O)6(SO4) · H2O
H MuscoviteKAl2(AlSi3O10)(OH)2
H OpalSiO2 · nH2O
H PargasiteNaCa2(Mg4Al)(Si6Al2)O22(OH)2
H PhlogopiteKMg3(AlSi3O10)(OH)2
H SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
H ScoroditeFe3+AsO4 · 2H2O
H TavoriteLiFe3+(PO4)(OH)
H TopazAl2(SiO4)(F,OH)2
H Tremolite◻Ca2Mg5(Si8O22)(OH)2
H UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
H Zoisite(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)
H Serpentine SubgroupD3[Si2O5](OH)4
H Allanite Group(A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH)
LiLithium
Li AmblygoniteLiAl(PO4)F
Li SpodumeneLiAlSi2O6
Li TavoriteLiFe3+(PO4)(OH)
BeBeryllium
Be BerylBe3Al2(Si6O18)
BBoron
B SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
B TourmalineAD3G6(T6O18)(BO3)3X3Z
CCarbon
C AzuriteCu3(CO3)2(OH)2
C CalciteCaCO3
C DolomiteCaMg(CO3)2
C GraphiteC
C MalachiteCu2(CO3)(OH)2
C RhodochrositeMnCO3
C SideriteFeCO3
OOxygen
O Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
O Quartz var. AgateSiO2
O AlbiteNa(AlSi3O8)
O AmblygoniteLiAl(PO4)F
O Quartz var. AmethystSiO2
O AndalusiteAl2(SiO4)O
O AnhydriteCaSO4
O ArsenoliteAs2O3
O AutuniteCa(UO2)2(PO4)2 · 10-12H2O
O AzuriteCu3(CO3)2(OH)2
O AlmandineFe32+Al2(SiO4)3
O BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
O BerylBe3Al2(Si6O18)
O CalciteCaCO3
O CassiteriteSnO2
O Quartz var. ChalcedonySiO2
O Clinoptilolite Subgroup(Na/Ca/K)3-6[Al6-7Si29-30O72] · 20H2O
O CupriteCu2O
O DiopsideCaMgSi2O6
O DolomiteCaMg(CO3)2
O FluorapatiteCa5(PO4)3F
O HematiteFe2O3
O HeterositeFe3+(PO4)
O HureauliteMn52+(PO3OH)2(PO4)2 · 4H2O
O KyaniteAl2(SiO4)O
O LeucophosphiteKFe23+(PO4)2(OH) · 2H2O
O MalachiteCu2(CO3)(OH)2
O MelanteriteFe2+(H2O)6(SO4) · H2O
O MicroclineK(AlSi3O8)
O MuscoviteKAl2(AlSi3O10)(OH)2
O OpalSiO2 · nH2O
O OrthoclaseK(AlSi3O8)
O PargasiteNaCa2(Mg4Al)(Si6Al2)O22(OH)2
O PhlogopiteKMg3(AlSi3O10)(OH)2
O QuartzSiO2
O RhodochrositeMnCO3
O Quartz var. Rose QuartzSiO2
O ScheeliteCa(WO4)
O SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
O ScoroditeFe3+AsO4 · 2H2O
O SideriteFeCO3
O SillimaniteAl2(SiO4)O
O SpessartineMn32+Al2(SiO4)3
O SpodumeneLiAlSi2O6
O Tantalite(Mn,Fe)(Ta,Nb)2O6
O Tapiolite(Fe,Mn)(Ta,Nb)2O6
O TavoriteLiFe3+(PO4)(OH)
O TenoriteCuO
O TitaniteCaTiO(SiO4)
O TopazAl2(SiO4)(F,OH)2
O TourmalineAD3G6(T6O18)(BO3)3X3Z
O Tremolite◻Ca2Mg5(Si8O22)(OH)2
O UraniniteUO2
O UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
O WollastoniteCa3(Si3O9)
O ZirconZr(SiO4)
O Zoisite(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)
O Albite var. CleavelanditeNa(AlSi3O8)
O Columbite-(Fe)-Columbite-(Mn) Series
O Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
O Garnet GroupX3Z2(SiO4)3
O Serpentine SubgroupD3[Si2O5](OH)4
O Allanite Group(A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH)
FFluorine
F AmblygoniteLiAl(PO4)F
F BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
F FluorapatiteCa5(PO4)3F
F FluoriteCaF2
F TopazAl2(SiO4)(F,OH)2
NaSodium
Na AlbiteNa(AlSi3O8)
Na Clinoptilolite Subgroup(Na/Ca/K)3-6[Al6-7Si29-30O72] · 20H2O
Na PargasiteNaCa2(Mg4Al)(Si6Al2)O22(OH)2
Na SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Na Albite var. CleavelanditeNa(AlSi3O8)
Na Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
MgMagnesium
Mg Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Mg BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Mg DiopsideCaMgSi2O6
Mg DolomiteCaMg(CO3)2
Mg PargasiteNaCa2(Mg4Al)(Si6Al2)O22(OH)2
Mg PhlogopiteKMg3(AlSi3O10)(OH)2
Mg Tremolite◻Ca2Mg5(Si8O22)(OH)2
AlAluminium
Al AlbiteNa(AlSi3O8)
Al AmblygoniteLiAl(PO4)F
Al AndalusiteAl2(SiO4)O
Al AlmandineFe32+Al2(SiO4)3
Al BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Al BerylBe3Al2(Si6O18)
Al Clinoptilolite Subgroup(Na/Ca/K)3-6[Al6-7Si29-30O72] · 20H2O
Al KyaniteAl2(SiO4)O
Al MicroclineK(AlSi3O8)
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al OrthoclaseK(AlSi3O8)
Al PargasiteNaCa2(Mg4Al)(Si6Al2)O22(OH)2
Al PhlogopiteKMg3(AlSi3O10)(OH)2
Al SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Al SillimaniteAl2(SiO4)O
Al SpessartineMn32+Al2(SiO4)3
Al SpodumeneLiAlSi2O6
Al TopazAl2(SiO4)(F,OH)2
Al Zoisite(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)
Al Albite var. CleavelanditeNa(AlSi3O8)
Al Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
SiSilicon
Si Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Si Quartz var. AgateSiO2
Si AlbiteNa(AlSi3O8)
Si Quartz var. AmethystSiO2
Si AndalusiteAl2(SiO4)O
Si AlmandineFe32+Al2(SiO4)3
Si BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Si BerylBe3Al2(Si6O18)
Si Quartz var. ChalcedonySiO2
Si Clinoptilolite Subgroup(Na/Ca/K)3-6[Al6-7Si29-30O72] · 20H2O
Si DiopsideCaMgSi2O6
Si KyaniteAl2(SiO4)O
Si MicroclineK(AlSi3O8)
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si OpalSiO2 · nH2O
Si OrthoclaseK(AlSi3O8)
Si PargasiteNaCa2(Mg4Al)(Si6Al2)O22(OH)2
Si PhlogopiteKMg3(AlSi3O10)(OH)2
Si QuartzSiO2
Si Quartz var. Rose QuartzSiO2
Si SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Si SillimaniteAl2(SiO4)O
Si SpessartineMn32+Al2(SiO4)3
Si SpodumeneLiAlSi2O6
Si TitaniteCaTiO(SiO4)
Si TopazAl2(SiO4)(F,OH)2
Si Tremolite◻Ca2Mg5(Si8O22)(OH)2
Si UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
Si WollastoniteCa3(Si3O9)
Si ZirconZr(SiO4)
Si Zoisite(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)
Si Albite var. CleavelanditeNa(AlSi3O8)
Si Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Si Garnet GroupX3Z2(SiO4)3
Si Serpentine SubgroupD3[Si2O5](OH)4
Si Allanite Group(A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH)
PPhosphorus
P AmblygoniteLiAl(PO4)F
P AutuniteCa(UO2)2(PO4)2 · 10-12H2O
P FluorapatiteCa5(PO4)3F
P HeterositeFe3+(PO4)
P HureauliteMn52+(PO3OH)2(PO4)2 · 4H2O
P LeucophosphiteKFe23+(PO4)2(OH) · 2H2O
P TavoriteLiFe3+(PO4)(OH)
SSulfur
S AnhydriteCaSO4
S ArsenopyriteFeAsS
S ChalcopyriteCuFeS2
S MelanteriteFe2+(H2O)6(SO4) · H2O
S PyriteFeS2
S PyrrhotiteFe1-xS
KPotassium
K BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
K Clinoptilolite Subgroup(Na/Ca/K)3-6[Al6-7Si29-30O72] · 20H2O
K LeucophosphiteKFe23+(PO4)2(OH) · 2H2O
K MicroclineK(AlSi3O8)
K MuscoviteKAl2(AlSi3O10)(OH)2
K OrthoclaseK(AlSi3O8)
K PhlogopiteKMg3(AlSi3O10)(OH)2
CaCalcium
Ca Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Ca AnhydriteCaSO4
Ca AutuniteCa(UO2)2(PO4)2 · 10-12H2O
Ca CalciteCaCO3
Ca Clinoptilolite Subgroup(Na/Ca/K)3-6[Al6-7Si29-30O72] · 20H2O
Ca DiopsideCaMgSi2O6
Ca DolomiteCaMg(CO3)2
Ca FluorapatiteCa5(PO4)3F
Ca FluoriteCaF2
Ca PargasiteNaCa2(Mg4Al)(Si6Al2)O22(OH)2
Ca ScheeliteCa(WO4)
Ca TitaniteCaTiO(SiO4)
Ca Tremolite◻Ca2Mg5(Si8O22)(OH)2
Ca UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
Ca WollastoniteCa3(Si3O9)
Ca Zoisite(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)
Ca Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
TiTitanium
Ti BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Ti TitaniteCaTiO(SiO4)
MnManganese
Mn HureauliteMn52+(PO3OH)2(PO4)2 · 4H2O
Mn RhodochrositeMnCO3
Mn SpessartineMn32+Al2(SiO4)3
Mn Tantalite(Mn,Fe)(Ta,Nb)2O6
Mn Tapiolite(Fe,Mn)(Ta,Nb)2O6
Mn Columbite-(Fe)-Columbite-(Mn) Series
FeIron
Fe Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Fe ArsenopyriteFeAsS
Fe AlmandineFe32+Al2(SiO4)3
Fe BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Fe ChalcopyriteCuFeS2
Fe HematiteFe2O3
Fe HeterositeFe3+(PO4)
Fe LeucophosphiteKFe23+(PO4)2(OH) · 2H2O
Fe MelanteriteFe2+(H2O)6(SO4) · H2O
Fe PyriteFeS2
Fe PyrrhotiteFe1-xS
Fe SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Fe ScoroditeFe3+AsO4 · 2H2O
Fe SideriteFeCO3
Fe Tantalite(Mn,Fe)(Ta,Nb)2O6
Fe Tapiolite(Fe,Mn)(Ta,Nb)2O6
Fe TavoriteLiFe3+(PO4)(OH)
Fe Columbite-(Fe)-Columbite-(Mn) Series
CuCopper
Cu AzuriteCu3(CO3)2(OH)2
Cu ChalcopyriteCuFeS2
Cu CupriteCu2O
Cu MalachiteCu2(CO3)(OH)2
Cu TenoriteCuO
AsArsenic
As ArsenoliteAs2O3
As ArsenopyriteFeAsS
As ScoroditeFe3+AsO4 · 2H2O
ZrZirconium
Zr ZirconZr(SiO4)
NbNiobium
Nb Tantalite(Mn,Fe)(Ta,Nb)2O6
Nb Tapiolite(Fe,Mn)(Ta,Nb)2O6
Nb Columbite-(Fe)-Columbite-(Mn) Series
SnTin
Sn CassiteriteSnO2
TaTantalum
Ta Tantalite(Mn,Fe)(Ta,Nb)2O6
Ta Tapiolite(Fe,Mn)(Ta,Nb)2O6
WTungsten
W ScheeliteCa(WO4)
AuGold
Au Native GoldAu
UUranium
U AutuniteCa(UO2)2(PO4)2 · 10-12H2O
U UraniniteUO2
U UranophaneCa(UO2)2(SiO3OH)2 · 5H2O

Fossils

There are 1 fossil locality from the PaleoBioDB database within this region.

These data are provided on an experimental basis and are taken from external databases. Mindat.org has no control currently over the accuracy of these data.

Occurrences1
Youngest Fossil Listed70.6 Ma (Late/Upper Cretaceous)
Oldest Fossil Listed83.5 Ma (Late/Upper Cretaceous)
Stratigraphic Units
UnitNo. OccurrencesAge
Montana - Pierre Shale - Sharon Springs183.5 - 70.6 Ma (Late/Upper Cretaceous)
Fossils from RegionClick here to show the list.
Accepted NameHierarchy Age
Pteranodon longiceps
species
Animalia : Chordata : Reptilia : Pterosauria : Pteranodontidae : Pteranodon : Pteranodon longiceps83.5 - 70.6 Ma
Late/Upper Cretaceous
Fossil LocalitiesClick to show 1 fossil locality

Other Databases

Wikipedia:https://en.wikipedia.org/wiki/Custer_State_Park
Wikidata ID:Q1803230
GeoNames ID:5763924

Localities in this Region

Other Regions, Features and Areas that Intersect

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

 
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 4, 2026 03:50:28 Page updated: July 24, 2026 17:05:36
Go to top of page