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Atlanta meteorite, Winn Parish, Louisiana, USA

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Latitude & Longitude (WGS84): 31° 48' North , 92° 45' West
Latitude & Longitude (decimal): 31.8, -92.75


Enstatite Chondrite, low-iron [EL6; S2], brecciated
1938 find, 5.5 kg

The Atlanta meteorite was sent to Harvey H. Nininger, the renown American (US) meteorite tracker in 1938 and is one of only 3 meteorites recovered in the state of Louisiana. Enstatite Chondrites are characterized by the dominant presence of the iron-poor Enstatite, accessory Fe-Ni metal and Troilite, plus a number of very reduced mineral phases. Many of these phases are extremely rare or unknown in terrestrial rocks. Atlanta belongs to the EL chemical group further characterized by the invariable presence of ferroan alabandite. Chondrites of petrologic Type EL6 are additionally characterized by abundant chondrules, homogenized olivine, and recrystallized fine-grained matrix. EL6 chondrites are by far the most abundant EL petrologic type.

Atlanta exhibits an unusual Troilite-rich clast and a Kamacite vein which are presumably due to early impact(s). Indeed, Rubin (1997) has argued that Atlanta and other EL breccias experienced high shock levels [S3-S5] which were subsequently overprinted by metamorphic heating and a later, somewhat milder S2 impact.

Mineral List


11 valid minerals.

The above list 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. H. (1966). The Enstatite Chondrites. Geochimica et Cosmochimica Acta 30, 23-30. (Jan 1966)

Keil, K. (1968). Mineralogical and Chemical Relationships among the Enstatite Chondrites, Journal of Geophysical Research 73 (22): 6945-6976. (Nov 1968)

Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam; London: New York. 245 pages.

Rubin, A. E. (1983) The Atlanta enstatite chondrite breccia, Meteoritics 18 (2): 113-121. (June 1983)

Rubin, A. E., Scott, E. R. D. & Keil, K. (1997) Shock metamorphism of enstatite chondrites, Geochimica et Cosmochimica Acta 61 (4): 847-858. (Feb 1997)

Grady, M. M. (2000). Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge, New York, Oakleigh, Madrid, Cape Town. 690 pages.

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