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Harrisonville meteorite, Cass Co., Missouri, USA

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Latitude & Longitude (WGS84): 38° 38' 59'' North , 94° 19' 59'' West
Latitude & Longitude (decimal): 38.65000,-94.33333
Non-native locality type:Meteorite
Köppen climate type:Cfa : Humid subtropical climate

Ordinary chondrite, veined (L6)
Find, 1963; 46.5 kg

After house to house canvassing by Harvey Nininger and colleagues led to the recovery of a 2 kg meteorite, additional efforts by a variety of collectors resulted in the recovery of over 40 stones by both Nininger and others. A flat surface on one stone appears to have been due to breakage along a preexistent lamella. Inspections reveal indistinct chondrules within a largely equilibrated matrix. Compositionally, equilibrated olivine (Fa24) and low Ca-orthopyroxene ('hypersthene') are characteristic of the L-chondrite geochemical group. Mineralogically the meteorite consists primarily of dominant olivine plus pyroxene accompanied by minor troilite, Fe-Ni metal and (plagioclase?) feldspar. Accessory chromite, copper, ilmenite, merrillite, and minor sulfides have been reported.

A relatively short U-He age of ~850 Ma suggests a possible major collision during the past eon.

As with many stones recovered in whole or in part by Harvey H. Nininger, the main mass is now at Arizona State University's Center for Meteorite Studies (14.5565 remained in 2017). ~10 kg has been at the United States National Museum in Washington.

Mineral List

7 valid minerals.

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Nininger, H.H. & Nininger, A.D. (1950) The Nininger Collection of Meteorites: A Catalogue and a History. Winslow, Arizona. 144 pages.
Nininger, H.H. (1952) Out of the Sky. Dover. 336 pp.
Keil, K. (1962) On the phase composition of meteorites. Journal of Geophysical Research 67(10): 4055-4062. (Sept 1962).
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).
Ramdohr, P. (1967)  Chromite and chromite chondrules in meteorites—I: Geochimica et Cosmochimica Acta 31(10): 1961-1967 [w. fig.]. (Oct 1967).
Fuchs, L.H. (1969) The Phosphate Mineralogy of Meteorites: IN: Meteoritic Research: Millman, P.M.-Ed.: pp. 683-695.D. Reidel Publishing Company: Dordrecht-Holland.
Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam; London: New York. 245 pages.
Graham, A. L., Bevan, A. W. R. & Hutchison, B. (1985) Catalogue of Meteorites (4/e). University of Arizona Press: Tucson.
Wasson, J. & Wang, S. (1991) The histories of ordinary chondrite parent bodies: U,Th-He age distributions. Meteoritics 26(2): 161-167. (June 1991).
Grady, M.M (2000). Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge; New York; Oakleigh; Madrid; Cape Town. 689 pages.

External Links - MeteoriticalBulletinDatabase - Harrisonville@MetBullDatabase

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