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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
Classification
  history:
Recommended:  Achondrite-ung    [explanation]

This is 1 of 124 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 15 Dec 2021
Writeuphelp
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:
Place of purchase:Western Sahara
Date:P 2021
Latitude:26.03884
Longitude:-9.27921
Mass (g):12400
Pieces:1
Class:Achondrite-ung
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:  
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)
Catalogs:
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:

Western Sahara
Coordinates:
     Recommended::   (26° 2' 20"N, 9° 16' 45"W)

Statistics:
     This is 1 of 262 approved meteorites from Western Sahara (plus 19 unapproved names)
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