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Keokuk is a city and the county seat of Lee County. It is known as the "Geode Capital of the World" due to the Keokuk geode beds in the surrounding area.
Geodes in Warsaw formation along Mississippi River and Des Moines River.
Note that the city of Keokuk is located in Lee County, not Keokuk County, Iowa.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Aragonite Formula: CaCO3 References: |
| ⓘ Baryte Formula: BaSO4 |
| ⓘ Calcite Formula: CaCO3 |
| ⓘ Chalcocite Formula: Cu2S |
| ⓘ Chalcopyrite Formula: CuFeS2 References: |
| ⓘ Dolomite Formula: CaMg(CO3)2 Description: Occurs in quartz geodes. |
| ⓘ Fluorite Formula: CaF2 |
| ⓘ Galena Formula: PbS References: |
| ⓘ Goethite Formula: Fe3+O(OH) |
| ⓘ Gypsum Formula: CaSO4 · 2H2O References: |
| ⓘ Hematite Formula: Fe2O3 |
| ⓘ Jarosite Formula: KFe3+3(SO4)2(OH)6 |
| ⓘ Kaolinite Formula: Al2(Si2O5)(OH)4 References: |
| ⓘ 'Limonite' References: |
| ⓘ Malachite Formula: Cu2(CO3)(OH)2 |
| ⓘ Marcasite Formula: FeS2 |
| ⓘ Millerite Formula: NiS |
| ⓘ 'Petroleum' References: |
| ⓘ Pyrite Formula: FeS2 References: |
| ⓘ Pyrolusite Formula: Mn4+O2 |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Siderite Formula: FeCO3 |
| ⓘ Smithsonite Formula: ZnCO3 |
| ⓘ Sphalerite Formula: ZnS |
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Chalcocite | 2.BA.05 | Cu2S |
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Millerite | 2.CC.20 | NiS |
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| ⓘ | Marcasite | 2.EB.10a | FeS2 |
| Group 3 - Halides | |||
| ⓘ | Fluorite | 3.AB.25 | CaF2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Goethite | 4.00. | Fe3+O(OH) |
| ⓘ | Hematite | 4.CB.05 | Fe2O3 |
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| ⓘ | Pyrolusite | 4.DB.05 | Mn4+O2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
| ⓘ | Siderite | 5.AB.05 | FeCO3 |
| ⓘ | Smithsonite | 5.AB.05 | ZnCO3 |
| ⓘ | Dolomite | 5.AB.10 | CaMg(CO3)2 |
| ⓘ | Aragonite | 5.AB.15 | CaCO3 |
| ⓘ | Malachite | 5.BA.10 | Cu2(CO3)(OH)2 |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| ⓘ | Baryte | 7.AD.35 | BaSO4 |
| ⓘ | Jarosite | 7.BC.10 | KFe3+3(SO4)2(OH)6 |
| ⓘ | Gypsum | 7.CD.40 | CaSO4 · 2H2O |
| Group 9 - Silicates | |||
| ⓘ | Kaolinite | 9.ED.05 | Al2(Si2O5)(OH)4 |
| Unclassified | |||
| ⓘ | 'Limonite' | - | |
| ⓘ | 'Petroleum' | - | |
List of minerals for each chemical element
Fossils
There are 9 fossil localities 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.
| Occurrences | 9 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Youngest Fossil Listed | 331 Ma (Carboniferous) | |||||||||
| Oldest Fossil Listed | 354 Ma (Carboniferous) | |||||||||
| Stratigraphic Units |
| |||||||||
| Fossils from Region | Click here to show the list. | |||||||||
| Fossil Localities | Click to show 3 fossil localities |
Other Databases
| Wikipedia: | https://en.wikipedia.org/wiki/Keokuk,_Iowa |
|---|---|
| Wikidata ID: | Q732549 |
| GeoNames ID: | 4863349 |
Other Regions, Features and Areas that Intersect
North AmericaContinent
North America PlateTectonic Plate
- Illinois BasinBasin
- Mazatzal DomainDomain
- Mazatzal TerraneVolcanic Arc
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Keokuk, Lee County, Iowa, USA