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Ilafegh 009 meteorite, Adrar Province, Algeria

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Latitude & Longitude (WGS84): 21° 37' 59'' North , 1° 16' 0'' East
Latitude & Longitude (decimal): 21.63333,1.26667
Other regions containing this locality:Northwest Africa Meteorites
Sahara Desert, North Africa
Non-native locality type:Meteorite
Meteorite Type:EL7 chondrite
Köppen climate type:BWh : Hot deserts climate


Enstatite Chondrite, low iron (EL7; W0/1; S4)
1989 find, 421 g; Shock-melted

Purchased in Algeria, the Ilafegh 009 meteorite is a highly shocked enstatite-rich stone with a composition very similar to that of the EL chondrites. There are, however, no chondrules. More than half of the stone consists of enstatite (mostly orthoenstatite; usually in ~cm-size crystals) with significant quantities of Ni-Fe metal (~27 wt%), troilite (~8 wt%), and plagioclase (~7 wt%). In addition there are a number of minor phases characteristic of Enstatite Chondrites. Two phases, Ferroan Alabandite and Kamacite with ~1% Si are usually reliable and specific indicators of the EL chemical group. Variable composition in both plagioclase and schreibersite plus various inhomogeneously distributed inclusions indicate rapidly cooling phases unable to reequilibrate after violent heating shocks. Radioactive dating suggests that Ilafegh 009 may have experienced a particularly violent shock event ~4.4 billion years ago — perhaps 150 million years after initial formation of it major components.

Within the meteoritical community there is serious unease with the proper terminology to use in describing these “shock-melted” meteorites with Enstatite Chondrite-like composition. Part of the problem seems to be that residual heating from original radioactive species and heating from violent events within the Enstatite clan formation zone were coeval and entangled events. McCoy et al. (1995) provide the best overall description of this particular meteorite and also provide a perspective for some of the general issues involved. However, the small amount of available material makes it doubly difficult to stitch together a completely satisfying account of this ancient, complex and intriguing stone.

Mineral List


10 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

Wlotzka, F. (ed.) (1991). Meteoritical Bulletin, No. 71. Meteoritics 26 (3): 255-262. (June 1991).

Bischoff, A., Palme, H., Geiger, T. & Spettel, B. (1992) Mineralogy and Chemistry of the EL-Chondritic Melt Rock Ilafegh-009 (Abstract): LPSC XXIII: page 105. (March 1992)

McCoy, T. J., Keil, K., Bogard, D., Casanova, I. & Lindstrom, M. M. (1992) ILAFEGH 009: A New Sample of the Diverse Suite of Enstatite Impact Melt Rocks (Abstract). LPSC XXIII: page 869. (March 1992)

McCoy, T. J. et al. (1995) Origin and history of impact-melt rocks of enstatite chondrite parentage: Geochimica et Cosmochimica Acta 59 (1): 161-175. (Feb 1995)

Leroux, H., Doukhan, J. C. & Bischoff, A. (1997) Mineralogy and crystallization history of the ILAFEGH 009 EL-chondritic impact-melt rock: An ATEM investigation. Meteoritics 32 (3): 365-372. (May 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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