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Al Bir Lahlou 001
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:help 12.4 kg
Recommended:  Achondrite-ung    [explanation]

This is 1 of 119 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 15 Dec 2021
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:
  Table 0
  Line 0:
Place of purchase:Western Sahara
Date:P 2021
Mass (g):12400
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):36.0±3.9
Ferrosilite (mol%):28.6±2.7
Wollastonite (mol%):3.6±0.9
Classifier:C. Agee, UNM
Type spec mass (g):22
Type spec location:UNM
Main mass:Said Bachir
Comments:Field name SBM-1; 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. 110, in preparation (2021)
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Western Sahara
     Recommended::   (26° 2' 20"N, 9° 16' 45"W)

     This is 1 of 259 approved meteorites from Western Sahara (plus 20 unapproved names)
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