Oakley (stone) meteorite, Logan County, Kansas, USAi
| Regional Level Types | |
|---|---|
| Oakley (stone) meteorite | Meteorite Fall Location |
| Logan County | County |
| Kansas | State |
| USA | Country |
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Latitude & Longitude (WGS84):
38° 57' North , 101° 1' West
Latitude & Longitude (decimal):
Meteorite Class:
Meteoritical Society Class:
Köppen climate type:
Ordinary chondrite, (H6)
Find, 1895; 27 kg
A farmer discovered a meteoritic stone at a depth of ~1m while plowing on his farm. When received by H.A. Ward its dimensions were ~17x25x30 cm. One side retained its original crust, but was partially marred by patches of yellowish patches of rust. The other side, however, was full of fractures and very rusted. Sectioning revealed a compact grayish black groundmass with streaks and discolorations as well as bright flecks of Fe-Ni metal and, under polish, numerous bronze troilite grains. Chondrules are usually indistinct, but a few scattered, well-defined spherical chondrules are present. Under the microscope barred olivine and radiating pyroxenes are the most prominent chondrule textures. Compositionally, bulk iron contents (~27 wt%Fe), equilibrated olivine (Fa21), and low Ca-orthopyroxene (Fs18.9) are characteristic of the H-chondrite geochemical group. Mineralogically the meteorite consists primarily of dominant olivine and pyroxene with minor plagioclase, troilite, and Fe-Ni metal. Accessory chromite and other minor opaques are found. Indeed, it is mildly surprising that even schreibersite has been reported from this rather weathered meteorite.
A K-Ar gas retention age of 4.3 Ga and a cosmic ray exposure (CRE) age of ~13.8 Ma have been reported.
Two specimens with a total mass of 8.8 kg are at the Field Museum of Natural History in Chicago. Several smaller moderate-size specimens are held elsewhere.
What's in a name?? The meteorite's proper name is the 'Oakley (stone)' meteorite. The 111 kg 'Oakley (iron)' meteorite was found near Oakley, Idaho in 1926.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsMineral List
12 valid minerals.
Meteorite/Rock Types Recorded
Note: data is currently VERY limited. Please bear with us while we work towards adding this information!
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
| ⓘ Chromite Formula: Fe2+Cr3+2O4 |
| ⓘ Copper Formula: Cu |
| ⓘ Diopside Formula: CaMgSi2O6 Description: Diopside [Wo44.7 Fs6.5 En48.8], Binns (1970). |
| ⓘ 'Fayalite-Forsterite Series' Description: Olivine composition [Fa23], Mason (1963). References: Mason, Brian (1963) Olivine composition in chondrites. Geochimica et Cosmochimica Acta, 27 (10) 1011-1023 doi:10.1016/0016-7037(63)90062-0 |
| ⓘ Graphite Formula: C |
| ⓘ Ilmenite Formula: Fe2+TiO3 |
| ⓘ Iron Formula: Fe |
| ⓘ Iron var. Kamacite Formula: (Fe,Ni) |
| ⓘ Isocubanite Formula: CuFe2S3 |
| ⓘ 'Limonite' |
| ⓘ Mackinawite Formula: FeS |
| ⓘ 'Orthopyroxene Subgroup' Description: Orthopyroxene [Fs16.9 En81.4 Wo1.7], Binns (1970). References: |
| ⓘ 'Plagioclase' Formula: (Na,Ca)[(Si,Al)AlSi2]O8 Description: Plagioclase composition [Or5.8 An12.0 Ab82.2], Van Schmus & Ribbe (1968). |
| ⓘ 'Plessite' |
| ⓘ Rutile Formula: TiO2 |
| ⓘ Schreibersite Formula: (Fe,Ni)3P |
| ⓘ Taenite Formula: (Fe,Ni) |
| ⓘ Troilite Formula: FeS References: |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Copper | 1.AA.05 | Cu |
| ⓘ | Iron | 1.AE.05 | Fe |
| ⓘ | var. Kamacite | 1.AE.05 | (Fe,Ni) |
| ⓘ | Taenite | 1.AE.10 | (Fe,Ni) |
| ⓘ | Schreibersite | 1.BD.05 | (Fe,Ni)3P |
| ⓘ | Graphite | 1.CB.05a | C |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Isocubanite | 2.CB.55b | CuFe2S3 |
| ⓘ | Troilite | 2.CC.10 | FeS |
| ⓘ | Mackinawite | 2.CC.25 | FeS |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Chromite | 4.BB.05 | Fe2+Cr3+2O4 |
| ⓘ | Ilmenite | 4.CB.05 | Fe2+TiO3 |
| ⓘ | Rutile | 4.DB.05 | TiO2 |
| Group 9 - Silicates | |||
| ⓘ | Diopside | 9.DA.15 | CaMgSi2O6 |
| Unclassified | |||
| ⓘ | 'Limonite' | - | |
| ⓘ | 'Fayalite-Forsterite Series' | - | |
| ⓘ | 'Plagioclase' | - | (Na,Ca)[(Si,Al)AlSi2]O8 |
| ⓘ | 'Plessite' | - | |
| ⓘ | 'Orthopyroxene Subgroup' | - | |
List of minerals for each chemical element
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Anadarko BasinBasin
- Great Plains DomainDomain
- Yavapai TerraneVolcanic Arc
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References
www.encyclopedia-of-meteorites.com (n.d.) http://www.encyclopedia-of-meteorites.com/test/Oakley_don_edwards.jpg
Mason, Brian (1963) Olivine composition in chondrites. Geochimica et Cosmochimica Acta, 27 (10) 1011-1023 doi:10.1016/0016-7037(63)90062-0
Hey, M. H., Easton, A. J. (1968) Copper in various phases of several olivine-hypersthene and olivine-bronzite chondrites. Mineralogical Magazine and Journal of the Mineralogical Society, 36 (282) 855-858 doi:10.1180/minmag.1968.036.282.14
