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Reggane 006
Basic information Name: Reggane 006
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2023
Country: Algeria
Mass:help 710 g
Meteoritical Bulletin:  MB 112  (2023)  OC4-an
Recommended:  OC4-an    [explanation]

This is the only approved meteorite classified as OC4-an.
Search for other: Ordinary chondrites, Ordinary chondrites (type 4-7)
Comments: Approved 29 Sep 2023
Writeup from MB 112:

Reggane 006        26°30’36.07"N, 1°13’45.45"E

Tamanghasset, Algeria

Find: 2022

Classification: OC4-an

History: Found in Algeria 27 km southwest of Akabli and 107 km east-southeast of Reggane. Acquired by M. Benzaki and B. Essbiti from a meteorite hunter on December 13, 2022, and subsequently purchased by Mark Lyon in January 2023.

Physical characteristics: A polished slice of this meteorite reveals numerous tightly packed chondrules with matrix metal which is disseminated throughout as fine grains but also occurring as thick prominent veins and masses decorating and bounding chondrules. This meteorite is mildly brecciated with fragmented chondrules present. Chondrules are variable in size with some up to ~1-2 mm in apparent diameter.

Petrography: (C. Agee, UNM) This meteorite consists primarily of porphyritic type I chondrules, Fe-Ni metal (kamacite), troilite, chromite, and Cl-rich apatite. Metal abundance is approximately 25% (volume). Plagioclase is present and the metamorphic grade is approximately type 4.

Geochemistry: (M. Spilde, UNM) Olivine Fa8.9±0.2, Fe/Mn=19±1, n=11; low-Ca pyroxene Fs9.5±1.2Wo0.6±0.5, Fe/Mn=13±2, n=8; augite Fs5.6±2.9Wo40.6±8.6, Fe/Mn=8±2, n=5; plagioclase Ab81.8±6.8An12.4±7.1Or5.7±1.9, n=8. Oxygen isotopes (K. Ziegler, UNM): 4 acid-washed fragments analyzed by laser fluorination gave δ18O= 5.071, 5.025, 5.410, 5.098; δ17O= 3.135, 3.186, 3.369, 3.223; Δ17O= 0.498, 0.573, 0.556, 0.572 (linearized, all per mil, TFL slope=0.52).

Classification: Ordinary chondrite, type 4, anomalous (OC4-an). Anomalous based on the oxygen isotope values and the Fa and Fs values.

Specimens: 20 g on deposit at UNM, Mark Lyon holds the main mass.

Data from:
  Table 0
  Line 0:
Mass (g):710
Shock stage:moderate
Weathering grade:moderate
Fayalite (mol%):8.9±0.2
Ferrosilite (mol%):9.5±1.2
Wollastonite (mol%):0.6±0.5
Classifier:C. Agee, UNM
Type spec mass (g):20
Type spec location:UNM
Main mass:Mark Lyon
Comments:Fieldname ML-50; submitted by C. Agee
Plots: O isotopes:  
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
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     Recommended::   (26° 30' 36"N, 1° 13' 45"E)

     This is 1 of 427 approved meteorites from Tamanghasset, Algeria (plus 2 unapproved names) (plus 2 impact craters)
     This is 1 of 1368 approved meteorites from Algeria (plus 31 unapproved names) (plus 4 impact craters)
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