Modoc (1948) meteorite, Scott Co., Kansas, USA
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Latitude & Longitude (WGS84): | 38° 30' North , 101° 6' West |
---|---|
Latitude & Longitude (decimal): | 38.50000,-101.10000 |
Non-native locality type: | Meteorite |
Meteorite Class: | H6 chondrite meteorite |
Meteoritical Society Class: | H6 |
Metbull: | View entry in Meteoritical Bulletin Database |
Köppen climate type: | BSk : Cold semi-arid (steppe) climate |
Ordinary Chondrite (H6)
Find,1948; 1.8 kg
A stone recovered several years before was identified as a meteorite in 1948 by Harvey Nininger. Classification as a member of the H-group ordinary chondrites follows from its olivine (Fa19) and orthopyroxene ('bronzite') composition. The major silicates are accompanied by Fe-Ni metal (kamacite, taenite), troilite, and accessory chromite. Ramdohr (1973) also observed minor quantities of copper, ilmenite, isocubanite, and pentlandite. Ramdohr, one of the most accomplished mineralogists of his era, apparently considered the two sulfides isocubanite and pentlandite as preterrestrial phases. This intriguing judgement might be confirmed or refuted by isotopic analyses as the oxygen fugacities within ordinary chondrites.
Not unsurprisingly, like many meteorites recovered by Nininger, the largest specimen of the Modoc (1948) meteorite is held at the Arizona State University [831 g in 2017].
What's in a name? A widely observed and more massive L6 chondrite had fallen in the same general area in 1905. The newly recognized meteorite was named Modoc (1948) while the earlier fall was renamed as the 'Modoc (1905)' meteorite. A slightly smaller specimen of Modoc (1905) is also held at ASU.
Mineral List
8 valid minerals.
Meteorite/Rock Types Recorded
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References
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Nininger, H.H. & Nininger, A.D. (1950) The Nininger Collection of Meteorites. A Catalogue and a History. Winslow, Arizona. 144 pp.
Mason, B. (1963) Olivine Composition in Chondrites: Geochimica et Cosmochimica Acta 27(9): 1011-1023. (Sept 1963).
Huss, G.I. (1971) Mounting Problems in the Naming of Meteorite Discoveries. Meteorites 6 (1): 21-25. (March 1971).
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.
External Links
http://www.lpi.usra.edu/meteor/metbull.php - MeteoriticalBulletinDatabase
http://www.lpi.usra.edu/meteor/metbull.php?code=16712 - Modoc (1948)@MetBullDatabase
http://www.encyclopedia-of-meteorites.com/test/16712_21745_2830.gif - photo of ASU specimen
https://meteorites.asu.edu/collection/specimen-catalogue — ASU collection
http://www.lpi.usra.edu/meteor/metbull.php?code=16712 - Modoc (1948)@MetBullDatabase
http://www.encyclopedia-of-meteorites.com/test/16712_21745_2830.gif - photo of ASU specimen
https://meteorites.asu.edu/collection/specimen-catalogue — ASU collection