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Ilafegh 009 meteorite, Adrar Province, Algeriai
Regional Level Types
Ilafegh 009 meteoriteMeteorite Fall Location
Adrar ProvinceProvince
AlgeriaCountry

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Key
Latitude & Longitude (WGS84):
21° 37' 59'' North , 1° 16' 0'' East
Latitude & Longitude (decimal):
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.

Regions containing this locality

African PlateTectonic Plate
Sahara Desert, North AfricaDesert
Northwest Africa MeteoritesMeteorite Fall Location

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


10 valid minerals.

Meteorite/Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed 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)
'Albite-Anorthite Series'
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)
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: MgSiO3
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)
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)

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Iron1.AE.05Fe
var: Kamacite1.AE.05(Fe,Ni)
Osbornite1.BC.15TiN
Schreibersite1.BD.05(Fe,Ni)3P
Group 2 - Sulphides and Sulfosalts
Alabandite2.CD.10MnS
Daubréelite2.DA.05Fe2+Cr3+2S4
Oldhamite2.CD.10(Ca,Mg)S
Troilite2.CC.10FeS
Group 9 - Silicates
Albite9.FA.35Na(AlSi3O8)
var: Oligoclase9.FA.35(Na,Ca)[Al(Si,Al)Si2O8]
Clinoenstatite9.DA.10MgSiO3
Enstatite9.DA.05MgSiO3
Unclassified Minerals, Rocks, etc.
'Albite-Anorthite Series'-
'Feldspar Group'-
'Nickel-iron'-
'Silica'-

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Iron
var: Kamacite
1.1.11.1(Fe,Ni)
Osbornite1.1.19.1TiN
Schreibersite1.1.21.2(Fe,Ni)3P
Group 2 - SULFIDES
AmXp, with m:p = 1:1
Alabandite2.8.1.4MnS
Troilite2.8.9.1FeS
AmBnXp, with (m+n):p = 3:4
Daubréelite2.10.1.11Fe2+Cr3+2S4
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Clinoenstatite65.1.1.1MgSiO3
Enstatite65.1.2.1MgSiO3
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite76.1.3.1Na(AlSi3O8)
Unclassified Minerals, Mixtures, etc.
var: Oligoclase-(Na,Ca)[Al(Si,Al)Si2O8]
'Albite-Anorthite Series'-
'Feldspar Group'-
Iron-Fe
'Nickel-iron'-
Oldhamite-(Ca,Mg)S
'Silica'-

List of minerals for each chemical element

NNitrogen
N OsborniteTiN
OOxygen
O EnstatiteMgSiO3
O ClinoenstatiteMgSiO3
O Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
O AlbiteNa(AlSi3O8)
NaSodium
Na Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Na AlbiteNa(AlSi3O8)
MgMagnesium
Mg EnstatiteMgSiO3
Mg Oldhamite(Ca,Mg)S
Mg ClinoenstatiteMgSiO3
AlAluminium
Al Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Al AlbiteNa(AlSi3O8)
SiSilicon
Si EnstatiteMgSiO3
Si ClinoenstatiteMgSiO3
Si Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Si AlbiteNa(AlSi3O8)
PPhosphorus
P Schreibersite(Fe,Ni)3P
SSulfur
S AlabanditeMnS
S Oldhamite(Ca,Mg)S
S TroiliteFeS
S DaubréeliteFe2+Cr23+S4
CaCalcium
Ca Oldhamite(Ca,Mg)S
Ca Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
TiTitanium
Ti OsborniteTiN
CrChromium
Cr DaubréeliteFe2+Cr23+S4
MnManganese
Mn AlabanditeMnS
FeIron
Fe Iron (var: Kamacite)(Fe,Ni)
Fe Schreibersite(Fe,Ni)3P
Fe TroiliteFeS
Fe DaubréeliteFe2+Cr23+S4
Fe IronFe
NiNickel
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


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