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Sioux County meteorite, Sioux Co., Nebraska, USA

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Fall 8 Aug 1933, Daytime fireball
Eucrite, monomict; 4.1 kg

After a daytime fireball was accompanied by detonations heard over a 250 km swath only twenty-odd small stones were eventually recovered. Sioux County's main constituents are a brecciated mix of abundant pyroxene accompanied by slightly less abundant anorthitic plagioclase. Pigeonite - with exolved augite - is the most conspicuous pyroxene. However, orthopyroxene predominates in some portions of the meteorite. Minor phases include other silicates and opaques — including some unusual Ni-poor iron found only in a few meteorite classes.

Sioux County is an ancient, brecciated rock whose primary components — like those of most Howardites, Eucrites, and Diogenites (HED Achondrites) — once lay near each other on or beneath the surface of a moderately large asteroid (apparently Vesta). In time chance, circumstance, and collisions have brought a small fraction of such stones into the earth's atmosphere and into the hands of humans.

Mineral List

13 entries listed. 8 valid minerals.

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Mason, B. (1967) The Bununu meteorite, and a discussion of the pyroxene-plagioclase achondrites: Geochimica et Cosmochimica Acta 31: 107-115.

Duke, M. B & Silver L. T. (1967) Petrology of eucrites, howardites and mesosiderites: Geochimica et Cosmochimica Acta 31:1637-1665.

Bunch, T. E. & Keil, K. (1971) Chromite and Ilmenite in non-chondritic meteoritics. American Mineralogist 56 (1/2); 146-157 (Jan/Feb 1971)

Nininger, H. H. (1972) Find a Falling Star: Paul S. Eriksson, Inc., New York. 254 pages, paper.

Mason B., Jarosewich, E. & Nelen, J. A. (1979) The pyroxene-plagioclase achondrites. Smithson. Contrib. Earth Sci. 22: 27-45.

Collinson, D. W. & Morden, S. J. (1992) Magnetic Properties of Some Achondrite Meteorites and Implications for Their Evolution (abstract): Meteoritics 27(3): 211-212. (July 1992)

Warren, P. H. & Kallemeyn, G. W. (1994) Sioux County: an orthocumulate, and systematics of V and other trace elements in several similar eucrites. Meteoritics 29 (4): p. 546. (July 1994)

Takeda, H., Nyquist, L. E., Yamaguchi, A., & Miyamoto, M. (1996) Recrystallization of Ca-Rich Phases in Eucrites and Constraints on the Time of the Crustal Metamorphism: Lunar Planetary Science XXVII: 1309-1310. (March 1996)

Hsu, W. & Crozaz, G. (1996) Mineral Chemistry and the petrogenesis of eucrites: I. Noncumulate eucrites: Geochimica et Cosmochimica Acta 60 (22): 4571-4591. (Nov 1996)

Mittlefehldt, D. W., Jones, J. H., Palme, H., Jarosewich, E. & Grady, M. M. (1998) Sioux County - A Study in Why Sleeping Dogs are Best Left Alone: Lunar Planetary Science XXIX: Abstract no. 1220. (March 1998)

Mittlefehldt, D. W., McCoy, T. J., Goodrich, C. A. & Kracher, A. (1998). Non-chondritic meteorites from asteroidal bodies. In: Planetary Materials (Papike, J. J., Editor): Chapter 4, 398 pages. Mineralogical Society of America: Washington, DC, USA. (1998)

Grady, M. M. (2000). Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge, New York, Oakleigh, Madrid, Cape Town. 690 pages.

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