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Broken Bow meteorite, Custer Co., Nebraska, USA

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Latitude & Longitude (WGS84): 41° 26' North , 99° 42' West
Latitude & Longitude (decimal): 41.43333,-99.70000
Non-native locality type:Meteorite
Köppen climate type:Dfa : Hot-summer humid continental climate


Ordinary chondrite (H4)
Find, 1937; 6.8 kg

A single stone was found. Inspections reveal distinct chondrules, chondrule fragments, and Fe-Ni metal within a moderately equilibrated and sometimes weathered matrix. Compositionally, mostly equilibrated olivine (Fa20) and roughly equilibrated low Ca-pyroxene are characteristic of H4-chondrites. Mineralogically, the meteorite consists primarily of dominant olivine and pyroxene along with minor plagioclase, troilite, and Fe-Ni metal. Accessory chromite and very minor copper, ilmenite, isocubanite, and mackinawite are also reported.

As with many meteorites collected by Harvey Nininger, a moderately large mass is held at the Center for Meteorite Studies [1.5938 kg in 2017].

Mineral List


8 valid minerals.

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References

Nininger, H.H. (1950) The Nininger Collection of Meteorites. A Catalogue and a History. Winslow, Arizona. 144 pages.

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

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.

Grady, M.M. (2000). Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge; New York; Oakleigh; Madrid; Cape Town. 689 pages.

Rubin, A.E. (2003) Chromite-plagioclase assemblages as a new shock indicator: Implications for the shock and thermal and histories of ordinary chondrites. Geochimica et Cosmochimica Acta 67 (14): 2695-2709. (July 2003).

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