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Errachidia 004
Basic information Name: Errachidia 004
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2020
Country: Morocco
Mass:help 2.64 kg
Meteoritical Bulletin:  MB 110  (2022)  Winonaite
Recommended:  Winonaite-an    [explanation]

This is 1 of 2 approved meteorites classified as Winonaite-an.   [show all]
Search for other: Primitive achondrites, Winonaites
Comments: Approved 13 Mar 2021
Revised 18 Jun 2024: reclassified anomalous
Writeup from MB 110:

Errachidia 004        32°2.418’N, 4°4.092’W

Errachidia, Morocco

Find: 2020

Classification: Primitive achondrite (Winonaite)

History: Found in 2020 by Mustapha Oulkouch and other finders in a strewnfield centered within the isolated rural community of Oued Naam. Later purchased by Sean Mahoney in February 2020.

Physical characteristics: Many small stones and fragments covered with a weathered fusion crust. 75% of the stones contain low amounts of visible metal; the remaining 25% contain high amounts of visible metal.

Petrography: (D. Sheikh, FSU) This sample features two distinct lithologies: 1) A low-metal lithology (<10 vol% metal) displaying a predominantly granoblastic texture composed of forsterite, enstatite, augite, and sodic plagioclase (Silicate grain size Av. 110±50 µm) with the mineral grain boundaries meeting at approximately 120° triple junctions. Kamacite and troilite are finely scattered throughout the interior as either veinlets or individual grains; some have been altered to form Fe-oxides. No chondrules were observed. 2) A high-metal lithology (up to 80 vol% metal) displaying a well-developed Widmanstätten pattern containing kamacite, taenite, plessite, and accessory troilite and schreibersite (kamacite band width Av. 2 mm, range 1-3 mm), and containing angular silicate inclusions of sodic plagioclase (some containing melt inclusions), augite, and enstatite (Silicate grain size Av. 350±50 µm). No chondrules were observed.

Geochemistry: Low-metal lithology: Forsterite (Fa0.8±0.3, range Fa0.4-1.4, FeO/MnO=2±1, n=30), Enstatite (Fs4.3±0.6 Wo1.7±0.2, range Fs1.6-4.9 Wo0.8-2.0, FeO/MnO=4±1, n=22), Augite (Fs2.0±0.4 Wo45.0±1.0, range Fs1.2-2.6 Wo44.1-46.7, Na2O=0.7±0.2 wt%, Cr2O3=1.1±0.6 wt%, FeO/MnO=3±1, n=7), Sodic Plagioclase (An10.8±0.8 Or4.0±1.6, range An10.2-11.4 Or2.8-5.1); High-metal lithology: Sodic Plagioclase (An12.2±2.6 Or3.9±0.6, range An9.7-19.5 Or1.9-5.3), Augite (Fs2.4±0.3 Wo43.0±1.1, range Fs1.8-3.0 Wo39.9-45.7, Na2O=0.9±0.1 wt%, Cr2O3=1.5±0.1 wt%, FeO/MnO=3±1, n=19), Enstatite (Fs4.5±0.5 Wo1.8±0.3, range Fs3.9-5.7 Wo1.4-2.2, FeO/MnO=4±1, n=8). Oxygen isotopes (K. Ziegler, UNM): analyses of acid-washed subsamples by laser fluorination gave, respectively, Low-metal lithology: (δ17O 2.296, 3.022, 2.588; δ18O 5.276, 6.655, 5.843; Δ17O -0.489, -0.491, -0.497 per mil), High-metal lithology: (δ17O 3.940, 2.666, 2.577; δ18O 8.197, 6.019, 5.881; Δ17O -0.388, -0.512, -0.528 per mil). ICP-MS data of metal separates from high-metal lithology, using sample of North Chile (Filomena) as standard (C. Herd and P. Hill, UAb): Ni = 7.4, Co = 0.30 (both wt%); Ir = 5.9, Ga = 28, Ge = 123, As = 10.1, Ru = 5.0, Re = 0.5, Os = 13.6, Pt = 9.5, Cu = 180, Au = 0.85 (all μg/g).

Classification: Primitive achondrite (Winonaite). The unusual occurrence of two distinct lithologies within this sample suggests a transitional classification between an endmember winonaite (low-metal lithology) and a silicate-rich IAB-complex iron (high-metal lithology). This is supported by the oxygen isotopes, texture, and mineral abundances and compositions for both distinct lithologies, and the siderophile element abundances of metal separates from the high-metal lithology.

Specimens: 25.2 g type specimen and two polished thin sections (one of each lithology) at UNM; 397 g high-metal and 905 g low-metal with Sean Mahoney, 65 g high-metal and 50 g low-metal with Juan Aviles Poblador, 215 g high-metal and 85 g low-metal with Kyle Josefy, 800 g low-metal with Mark Lyon, 61 g high-metal and 61 g low-metal with Topher Spinnato.

Writeup from MB 113:
Errachidia 004: reclassification

(D. Sheikh, Cascadia): Although winonaites can display various textures and compositions, Errachidia 004 is unique compared to other winonaites in that it represents a polymict assemblage of various different winonaite lithologies, e.g., ultramafic and basaltic (Sheikh, 2021). Although the low metal lithology displays the commonly observed ultramafic assemblage characteristic of most winonaites, the high metal lithology displays an overall basaltic texture and unique variation in mineral modal abundance, with some pieces consisting of >50 vol. % plagioclase and no olivine (as similarly observed in recently classified NWA 15487). Other lithologies, with >70 vol. % Fe-Ni metal, are "transitional" between metal-bearing winonaites and silicate-bearing IAB iron meteorites. In some cases, high- and low-metal lithologies are juxtaposed against each other. Overall, Errachidia 004 is unique among winonaites and should be designated as anomalous.
  • Sheikh D. (2021) Petrology and Geochemistry of Errachidia 004, a Polymict Winonaite Composed of Distinct High and Low Metal Lithologies. 84th Annual Meeting of the Meteoritical Society, August 15-21, 2021, Chicago, Illinois. LPI Contribution No. 2609, abstract 6253. (link)
Data from:
  Table 0
  Line 0:
Origin or pseudonym:Oued Naam
Mass (g):2639
Shock stage:low
Weathering grade:moderate
Classifier:D. Sheikh, FSU; K. Ziegler, UNM; C. Agee, UNM
Type spec mass (g):25.2
Type spec location:UNM
Main mass:Sean Mahoney
Comments:Submitted by Daniel Sheikh
Plots: O isotopes:  
   and collections
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
UAb: 1-26 Earth Sciences Building, University of Alberta, Edmonton, AB, T6G 2E3, Canada, Canada; Website (institutional address; updated 17 Oct 2011)
FSU: Department of Geological Sciences, Florida State University, Tallahassee FL 32306-4100, United States (institutional address; updated 16 Dec 2010)
LPI: Lunar and Planetary Institute, 3600 Bay Area Blvd., Houston, TX 77058 , United States; Website (institutional address; updated 20 Jun 2022)
References: Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
Published in Meteoritical Bulletin, no. 113, in preparation (2024)
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     Recommended::   (32° 2' 25"N, 4° 4' 6"W)

     This is 1 of 3 approved meteorites from Errachidia, Morocco
     This is 1 of 2089 approved meteorites from Morocco (plus 32 unapproved names) (plus 1 impact crater)
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