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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 118 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 Meteoritical Bulletin, no. 110, in preparation (2021)
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Geography:
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Statistics: This is 1 of 250 approved meteorites from Western Sahara (plus 20 unapproved names) | ||||||||||||||||||||||||||||||||||
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