Norton County meteorite, Norton Co., Kansas, USA
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|Latitude & Longitude (WGS84):||39° 40' 59'' North , 99° 52' 0'' West|
|Latitude & Longitude (decimal):||39.68333,-99.86667|
|Non-native locality type:||Meteorite|
|Meteorite Class:||Aubrite meteorite|
|Meteoritical Society Class:||Aubrite|
|Metbull:||View entry in Meteoritical Bulletin Database|
|Köppen climate type:||Dfa : Hot-summer humid continental climate|
Aubrite, brecciated (aubrite, br; S1-S4)
Fall, 18 February 1948; 1.1 ton
The largest of the 9 witnessed aubrite falls (enstatite achondrites). On 18 February 1948 the meteor fireball was seen over a large area. 7 stones were recovered. However, the largest mass (~1 ton) was not located until May. Virtually all of the original constituents of Norton County, like all aubrites, were formed in an utterly reducing environment, and as the largest aubrite — its mineralogy has been subject to intense scrutiny. Its chemical, mineralogical, and isotopic composition have been studied at all levels. Its pyroxene and sulfide components formed in an extremely reduced environment, especially, have been subject to intense scrutiny.
Norton County, like most aubrite falls, has experienced extensive brecciation followed by uneven re-equilibration with quite variable shock levels in both olivine (S1-S4) and enstatite (S1-S3).
A caveat. Gypsum, manganite, some carbonates and two new minerals (cronusite and schöllhornite) appear to be products of the large mass's 3 month exposure to 'the elements', i.e. weathering products.
25 valid minerals. 3 (TL) - type locality of valid minerals.
Meteorite/Rock Types Recorded
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Entries shown in red are rocks recorded for this region.
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F. C. Leonard (1946). The Furnas County stone of the Norton County, Kansas-Furnas County Nebraska, achondritic fall. Popular Astronomy, Vol. 56, pp.434-436.
Klaus Keil, Kurt Fredriksson (1963) Electron microprobe analysis of some rare minerals in the Norton County achondrite. Geochimica et Cosmochimica Acta Volume 27, Issue 9, September 1963, Pages 939–942.
Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam; London: New York. 245 pages.
Okada, A., Keil, K., Leonard, B. F., & Hutcheon, I. D. (1984). Schöllhornite, Na0. 3 (H2O) 1 [CrS2] a New Mineral in the Norton County Enstatite Achondrite. Meteoritics, 19, 284.
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, 195 pages. Mineralogical Society of America: Washington, DC, USA.
Keil, K. (2010) Enstatite achondrite meteorites (aubrites) and the histories of their asteroidal parent bodies: Chemie der Erde : Beiträge zur chemischen Mineralogie, Petrographie und Geologie. 70, no. 4, (2010): 295-317.
Rubin, A. E. (2015). Shock and annealing in aubrites: Implications for parent-body history. Meteoritics & Planetary Science 50(7): 1217-1227. (July 2014).