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| Al Bir Lahlou 001 | |||||||||||||||||||||||||||||||||||
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| Basic information | Name: Al Bir Lahlou 001 This is an OFFICIAL meteorite name. Abbreviation: ABL 001 Observed fall: No Year found: 2021 Country: Western Sahara Mass:  12.4 kg | ||||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 131 approved meteorites classified as Achondrite-ung. [show all] Search for other: Achondrites, Ungrouped achondrites | ||||||||||||||||||||||||||||||||||
| Comments: | Approved 15 Dec 2021 | ||||||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 110:
Al Bir Lahlou 001 (ABL 001) 26.03884, -9.27921 Western Sahara Purchased: 2021 Classification: Ungrouped achondrite History: The stone was found by meteorite hunters in Western Sahara. Physical characteristics: Smooth sand blasted exterior and saw-cut, exposed interior show a cumulate intermingling of cream-colored plagioclase grains and vivid-green pyroxene grains. Petrography: (C. Agee and A. Ross, UNM) This meteorite contains approximately 60% plagioclase, 35% low-Ca pyroxene, minor phases include olivine, low-Ni iron metal, and Cr-spinel. Grain boundaries between plagioclase and pyroxene are gradational and occupied by blebby intergrowths of both phases. Olivine was observed as small (~100 μm) inclusions in pyroxene. Metal is nearly pure iron with trace amounts of cobalt -- nickel was barely detectable with the microprobe. Geochemistry: (A. Ross, UNM) Olivine Fa36.0±3.9, Fe/Mn=35±2, n=6; low-Ca pyroxene Fs28.6±2.7Wo3.6±0.9, Fe/Mn=22±1, Cr2O3=0.77±.14 (wt%), n=6; plagioclase An97.9±0.1Ab2.0±0.1Or0.1±0.0, n=4; iron metal Co=0.24±0.10 (wt%), n=5. Oxygen isotopes (K. Ziegler, UNM): 3 acid-washed fragments analyzed by laser fluorination gave δ18O= 3.821, 3.829, 3.939; δ17O= 1.723, 1.731, 1.792; Δ17O= -0.295, -0.291, -0.288 (linearized, per mil, TFL slope=0.528). Classification: Ungrouped achondrite. This meteorite is a norite. It has oxygen isotopes values that are about 0.05 per mil below the HED array. The pyroxene compositions are similar to that found in diogenites, however the plagioclase abundance (60%) of this norite is much higher than in any diogenite (orthopyroxenite). The anorthite (An98) content of the plagioclase is significantly higher than typical HED values. Specimens: 22 g including a probe mount on deposit at UNM, Said Bachir holds the main mass. | ||||||||||||||||||||||||||||||||||
| Data from: MB110 Table 0 Line 0: |
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| Plots: | O isotopes: | ||||||||||||||||||||||||||||||||||
| Institutions 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) |
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| 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
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Geography:
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Statistics: This is 1 of 265 approved meteorites from Western Sahara (plus 20 unapproved names) | ||||||||||||||||||||||||||||||||||
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