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Oakley (stone) meteorite, Logan Co., Kansas, USA

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Latitude & Longitude (WGS84): 38° 57' North , 101° 1' West
Latitude & Longitude (decimal): 38.95000,-101.01667
Non-native locality type:Meteorite
Köppen climate type:BSk : Cold semi-arid (steppe) climate


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.

Mineral List


12 valid minerals.

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

Preston, H. L. (1900) On a new Meteorite from Oakley, Logan County, Kansas. American Journal of Science and Arts Vol. 9: 4100-4102.

Merrill, G. P. (1916) Handbook and Descriptive Catalogue of the Meteorite Collections in the U.S. National Museum. Bull. U. S. Natl. Museum, No.94, Washington. 207 pp., 41 pls.

Mason, B. (1963) Olivine in ordinary chondrites. Geochimica et Cosmochimica Acta 27(9): 1011-1023. (Sept 1963).

Keil, K. & Fredriksson, K. (1964) The Fe, Mg and Ca Distribution in Coexisting Olivines and Rhombic Pyroxenes of Chondrites. Journal of Geophysical Research Atmospheres 69 (16): 3487-3515. (August 1964).

Hey, M.H. & Easton. A.J. (1968) Copper in various phases of several olivine hypersthene and olivine-bronzite chondrites: Mineralogical Magazine 36 (282): 855-858. (June 1968).

Van Schmus, W.R. & Ribbe, P.H. (1968) The composition and structural state of feldspar from chondritic meteorites: Geochimica et Cosmochimica Acta 32(12): 1327-1342. (Dec. 1968).

Taylor, G.J. (1968) On the Thermal History of Chondrites: Master's Thesis: Rice University. 73 pages.

Snetsinger, K.G. & Keil, K. (1969) Ilmenite in ordinary chondrites. Amer. Mineral. 54 (5/6):780-786. (May-June 1969).

Binns, R.A. (1970) Pyroxenes from non-carbonaceous chondritic meteorites: Mineralogical Magazine 37(290): 855-669. (June 1970).

Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam; London: New York. 245 pages.

Graf, Th. & Marti, K. (1995) Collisional history of H chondrites. J. Geophys. Res. (Planets) 100, 21247–21263.
Grady, M.M (2000). Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge; New York; Oakleigh; Madrid; Cape Town. 689 pages.

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