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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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This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

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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