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Atwood meteorite, Logan Co., Colorado, USA

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Latitude & Longitude (WGS84): 40° 31' North , 103° 16' West
Latitude & Longitude (decimal): 40.51667,-103.26667
Non-native locality type:Meteorite
Meteorite Class:L6 chondrite meteorite
Meteoritical Society Class: L6
Metbull:View entry in Meteoritical Bulletin Database
Köppen climate type:BSk : Cold semi-arid (steppe) climate

Ordinary chondrite (L6)
Find, 1963; 2.1 kg

Three fragments of a single meteoric stone were found. Inspections reveal indistinct chondrules within an equilibrated matrix. Compositionally, equilibrated olivine (Fa25) and low Ca-orthopyroxene ('hypersthene') are characteristic of the L-chondrite geochemical group. Mineralogically, the meteorite consists primarily of dominant olivine plus pyroxene accompanied by minor troilite and Fe-Ni metal. Accessory chromite, copper, ilmenite and minor sulfides are also reported. Goethite, a common meteorite weatherates, was observed in detail in an early use of Mössbauer spectroscopy to study meteorites (Herr & Skerra (1969).

A U-He age of ~1.14 Ga is reported, possibly indicative of a major collision involving an intermediate parent body (IPB) during the last one or two eons.

Mineral List

8 valid minerals.

Meteorite/Rock Types Recorded

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Mason, B. (1967) Olivine Composition in Chondrites—a supplement: Geochimica et Cosmochimica Acta 31(6):1100-1103. (June 1967).
Taylor, G.J. (1968) On the Thermal History of Chondrites: Master's Thesis: Rice University. 73 pages.
Herr, W. & Skerra, B. (1969) Mössbauer Spectroscopy applied to the classification of stone meteorites. IN: Meteoritic Research: Millman, P.M.-Ed.: pp. 106-122. D. Reidel Publishing Company: Dordrecht-Holland.
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.
Wasson, J.T. & Wang, S. (1991) The histories of ordinary chondrite parent bodies: U,Th-He age distributions. Meteoritics 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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