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Elm Creek meteorite, Lyon Co., Kansas, USA

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Latitude & Longitude (WGS84): 38° 30' North , 96° 12' West
Latitude & Longitude (decimal): 38.50000,-96.20000
Non-native locality type:Meteorite
Köppen climate type:Cfa : Humid subtropical climate

Ordinary chondrite, gas-rich (H4)
Find, 1906; 7 kg

A mass was plowed up 5 km from Admire. The meteorite was described by Merrill as a dark grey compact stone with numerous small metal grains on a polished surface. A few reddish partially oxidized regions are notable in photographs. While chondrules are somewhat indistinct to the naked eye, both olivine and pyroxene chondrules are readily observed under the microscope. Olivine [Fa18] and pyroxene ['Bronzite'] composition are characteristic of the H (high iron) ordinary chondrite chemical group. The presence of both Ca-poor orthopyroxene and clinopyroxenes are indicative of the partially equilibrated pyroxene crystal structures found in type 4 ordinary chondrites. The presence of somewhat unusual graphite- magnetite and silicate-fayalite assemblages may merit some additional study. Pentlandite (sometimes found in fresh chondritic falls) is found here as a terrestrial weathering product.

A cosmic ray exposure age of ~74 Ma has been recorded.

Major Repositories: Masses in the 200—1000 g range have been retained at the United States National Museum (Washington), Natural History Museum (London), the Field Museum of Natural History (Chicago), the Naturhistorisches Museum (Wiens/Vienna), and at Harvard University.

Mineral List

8 valid minerals.

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Howard, K.S. (1907) The Elm Creek Aerolite: American Journal of Science and Arts (4th Series) Vol 23: 379-381.
Merrill, G. P. (1916) Handbook and Descriptive Catalogue of the Meteorite Collections in the U.S. National Museum. Bull. U. S. Natl. Museum, No.94, Washington. 207 pp., 41 pls.
Mason, B. (1963) Olivine in ordinary 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.
Scott, E.R.D. et al. (1981) Graphite - Magnetite Inclusions in Ordinary Chondrites: an Important Constituent in the Early Solar System (Abstract). Lunar and Planetary Science XII: 955-957.
Graf, Th. & Marti, K. (1995) Collisional history of H chondrites. J. Geophys. Res. (Planets) 100: 21247–21263.
Wasson, J.J. & Wang, S. (1991) The histories of ordinary chondrite parent bodies: U,Th-He age distributions Meteoritics & Planetary Science 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.

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