Ilafegh 009 meteorite, Bordj Badji Mokhtar, Bordj Badji Mokhtar District, Bordj Badji Mokhtar Province, Algeriai
| Regional Level Types | |
|---|---|
| Ilafegh 009 meteorite | Meteorite Fall Location |
| Bordj Badji Mokhtar | Commune |
| Bordj Badji Mokhtar District | District |
| Bordj Badji Mokhtar Province | Province |
| Algeria | Country |
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Latitude & Longitude (WGS84):
21° 37' 59'' North , 1° 16' 0'' East
Latitude & Longitude (decimal):
Locality type:
Meteorite Class:
Meteoritical Society Class:
Köppen climate type:
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 its 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.
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Standard Detailed Gallery Strunz Chemical ElementsMineral List
10 valid minerals.
Meteorite/Rock Types Recorded
Note: data is currently VERY limited. Please bear with us while we work towards adding this information!
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
| ⓘ Alabandite Formula: MnS Description: Alabandite — Ferroan Alabandite is an indicator for the EL chemical group of Enstatite; Associated with and embedded with troilite Reference: 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) |
| ⓘ Albite Formula: Na(AlSi3O8) Reference: 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) |
| ⓘ Albite var. Oligoclase Formula: (Na,Ca)[Al(Si,Al)Si2O8] Reference: 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) |
| ⓘ Clinoenstatite Formula: MgSiO3 Description: minor, but pervasive Reference: 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) |
| ⓘ Daubréelite Formula: Fe2+Cr3+2S4 Description: Associated with the more abundant troilite Reference: 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) |
| ⓘ Enstatite Formula: Mg2Si2O6 Description: Usually as moderately large crystals up to 1 cm in size. Often contains trapped inclusions with diverse mineralogies Reference: Wlotzka, F. (ed.) (1991). Meteoritical Bulletin, No. 71. Meteoritics 26 (3): 255-262. (June 1991).; 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) |
| ⓘ 'Feldspar Group' Description: Found in small inclusions within large Enstatite crystals Reference: 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) |
| ⓘ Iron Formula: Fe Description: abundant, but somewhat disordered in some instances Reference: Wlotzka, F. (ed.) (1991). Meteoritical Bulletin, No. 71. Meteoritics 26 (3): 255-262. (June 1991).; 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) |
| ⓘ Iron var. Kamacite Formula: (Fe,Ni) Description: abundant, but somewhat disordered in some instances Reference: Wlotzka, F. (ed.) (1991). Meteoritical Bulletin, No. 71. Meteoritics 26 (3): 255-262. (June 1991).; 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) |
| ⓘ 'Nickel-iron' Reference: 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. et al. (1995) Origin and history of impact-melt rocks of enstatite chondrite parentage: Geochimica et Cosmochimica Acta 59 (1): 161-175. (Feb 1995) |
| ⓘ Oldhamite Formula: (Ca,Mg)S Reference: 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) |
| ⓘ Osbornite Formula: TiN Description: 3 small grains Reference: 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) |
| ⓘ 'Plagioclase' Formula: (Na,Ca)[(Si,Al)AlSi2]O8 Description: Variable, but with a strong oligoclase component Reference: 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) |
| ⓘ Schreibersite Formula: (Fe,Ni)3P Description: Ni-content variable Reference: 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. et al. (1995) Origin and history of impact-melt rocks of enstatite chondrite parentage: Geochimica et Cosmochimica Acta 59 (1): 161-175. (Feb 1995) |
| ⓘ 'Silica' Description: various small and unidentified silica phases are reported (sometimes associated with K-oxide) Reference: 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. 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) |
| ⓘ Troilite Formula: FeS Reference: 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) |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Iron | 1.AE.05 | Fe |
| ⓘ | var. Kamacite | 1.AE.05 | (Fe,Ni) |
| ⓘ | Osbornite | 1.BC.15 | TiN |
| ⓘ | Schreibersite | 1.BD.05 | (Fe,Ni)3P |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Alabandite | 2.CD.10 | MnS |
| ⓘ | Daubréelite | 2.DA.05 | Fe2+Cr3+2S4 |
| ⓘ | Oldhamite | 2.CD.10 | (Ca,Mg)S |
| ⓘ | Troilite | 2.CC.10 | FeS |
| Group 9 - Silicates | |||
| ⓘ | Albite | 9.FA.35 | Na(AlSi3O8) |
| ⓘ | var. Oligoclase | 9.FA.35 | (Na,Ca)[Al(Si,Al)Si2O8] |
| ⓘ | Clinoenstatite | 9.DA.10 | MgSiO3 |
| ⓘ | Enstatite | 9.DA.05 | Mg2Si2O6 |
| Unclassified Minerals, Rocks, etc. | |||
| ⓘ | 'Feldspar Group' | - | |
| ⓘ | 'Nickel-iron' | - | |
| ⓘ | 'Plagioclase' | - | (Na,Ca)[(Si,Al)AlSi2]O8 |
| ⓘ | 'Silica' | - | |
List of minerals for each chemical element
| N | Nitrogen | |
|---|---|---|
| N | ⓘ Osbornite | TiN |
| O | Oxygen | |
| O | ⓘ Enstatite | Mg2Si2O6 |
| O | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| O | ⓘ Clinoenstatite | MgSiO3 |
| O | ⓘ Albite var. Oligoclase | (Na,Ca)[Al(Si,Al)Si2O8] |
| O | ⓘ Albite | Na(AlSi3O8) |
| Na | Sodium | |
| Na | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Na | ⓘ Albite var. Oligoclase | (Na,Ca)[Al(Si,Al)Si2O8] |
| Na | ⓘ Albite | Na(AlSi3O8) |
| Mg | Magnesium | |
| Mg | ⓘ Enstatite | Mg2Si2O6 |
| Mg | ⓘ Oldhamite | (Ca,Mg)S |
| Mg | ⓘ Clinoenstatite | MgSiO3 |
| Al | Aluminium | |
| Al | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Al | ⓘ Albite var. Oligoclase | (Na,Ca)[Al(Si,Al)Si2O8] |
| Al | ⓘ Albite | Na(AlSi3O8) |
| Si | Silicon | |
| Si | ⓘ Enstatite | Mg2Si2O6 |
| Si | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Si | ⓘ Clinoenstatite | MgSiO3 |
| Si | ⓘ Albite var. Oligoclase | (Na,Ca)[Al(Si,Al)Si2O8] |
| Si | ⓘ Albite | Na(AlSi3O8) |
| P | Phosphorus | |
| P | ⓘ Schreibersite | (Fe,Ni)3P |
| S | Sulfur | |
| S | ⓘ Alabandite | MnS |
| S | ⓘ Oldhamite | (Ca,Mg)S |
| S | ⓘ Troilite | FeS |
| S | ⓘ Daubréelite | Fe2+Cr23+S4 |
| Ca | Calcium | |
| Ca | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Ca | ⓘ Oldhamite | (Ca,Mg)S |
| Ca | ⓘ Albite var. Oligoclase | (Na,Ca)[Al(Si,Al)Si2O8] |
| Ti | Titanium | |
| Ti | ⓘ Osbornite | TiN |
| Cr | Chromium | |
| Cr | ⓘ Daubréelite | Fe2+Cr23+S4 |
| Mn | Manganese | |
| Mn | ⓘ Alabandite | MnS |
| Fe | Iron | |
| Fe | ⓘ Iron var. Kamacite | (Fe,Ni) |
| Fe | ⓘ Schreibersite | (Fe,Ni)3P |
| Fe | ⓘ Troilite | FeS |
| Fe | ⓘ Daubréelite | Fe2+Cr23+S4 |
| Fe | ⓘ Iron | Fe |
| Ni | Nickel | |
| Ni | ⓘ Iron var. Kamacite | (Fe,Ni) |
| Ni | ⓘ Schreibersite | (Fe,Ni)3P |
References
Sort by
Year (asc) Year (desc) Author (A-Z) Author (Z-A)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.
External Links
https://www.lpi.usra.edu/meteor/metbull.php?code=12014 = Ilafegh 009 @ Meteoritical Bulletin Database
Other Regions, Features and Areas containing this locality
African PlateTectonic Plate
- Taoudenni basinBasin
North Africa
- Sahara DesertDesert
Northwest Africa MeteoritesGroup of Meteorite Fall Locations
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