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Sebkha el Melah 001
Basic information Name: Sebkha el Melah 001
     This is an OFFICIAL meteorite name.
Abbreviation: SeM 001
Observed fall: No
Year found: 2022
Country: Mali
Mass:help 17 kg
Classification
  history:
Meteoritical Bulletin:  MB 111  (2023)  Aubrite
Recommended:  Aubrite    [explanation]

This is 1 of 83 approved meteorites classified as Aubrite.   [show all]
Search for other: Achondrites, Aubrites, Enstatite achondrites, and Enstatite-rich meteorites
Comments: Approved 12 Nov 2022
Writeuphelp
Writeup from MB 111:

Sebkha el Melah 001 (SeM 001)        21.63885, -1.82974

Gao, Mali

Find: 2022 Mar

Classification: Enstatite achondrite (Aubrite)

History: This meteorite was found in late March 2022 in the region of "Wad Alhath" in Mali, about 54 km northeast of the village of Tamanieret and 245 km southeast of Taoudenni, by Sahrawi meteorite hunters. The total recovered amount was approximately 17 kg. Bachir Salek obtained 12.5 kg, including the main mass, which weighs 3550 g.

Physical characteristics: This meteorite consists primarily of clusters of coarse, interlocking enstatite crystals with a pegmatitic texture. Individual crystals are cm-sized, many showing distinct cleavage planes and traces. Some enstatite crystals are milky-white in color, while a few are colorless translucent to transparent and gemmy. The enstatite crystals separate from the clusters easily, and the largest single crystal weighed 45 grams and was approximately 5 cm long and 2 cm wide. There are also scattered dark-colored patches on some of the crystals. Significant amounts of smooth cream-colored to white fusion crust are visible, although some fusion crust is dark-colored. No vesicles are present. The meteorite appears to be unbrecciated.

Petrography: (A. Ross and C. Agee, UNM) Electron microprobe analyses and reflected light microscopy show that enstatite makes up approximately 98% of this meteorite. Scattered small diopside grains were detected. A single olivine grain was found in the sample microprobe mount. Small grains of kamacite, taenite, schreibersite, Ti-troilite, troilite, and daubreelite were the only accessory opaques observed. No other sulfides were detected. No feldspar was found in the microprobe mount.

Geochemistry: (A. Ross, UNM) Enstatite Fs0.0±0.0Wo0.9±0.1, n=6; diopside Fs0.0±0.0Wo45.5±0.8, n=3; forsterite Fa0.0, n=1; kamacite Ni=4.3±0.8, Co=0.4±0.2 (wt%); taenite Ni=48.7, Co=0.11 (wt%).

Classification: Aubrite, non-brecciated (after Keil, 1989). This aubrite has one of the highest modal abundances of enstatite ever reported (~98%). The enstatite, diopside, and forsterite of this meteorite have some of lowest iron contents (below electron microprobe major element detection limits) ever documented in an aubrite.

Specimens: 216 g on deposit at UNM, Bachir Salek holds the main mass.

Bibliography:
  • Keil K. (1989) Enstatite meteorites and their parent bodies. Meteoritics 24, 195–208. (link)
Data from:
  MB111
  Table 0
  Line 0:
State/Prov/County:Gao
Place of purchase:Mali
Date:2022 Mar
Latitude:21.63885
Longitude:-1.82974
Mass (g):17 kg
Pieces:Several
Class:Aubrite
Shock stage:low
Weathering grade:low
Fayalite (mol%):0
Ferrosilite (mol%):0.0±0.0
Wollastonite (mol%):0.9±0.1
Classifier:C. Agee, UNM
Type spec mass (g):216
Type spec location:UNM
Main mass:Bachir Salek
Comments:Field name BAS-36; submitted by C. Agee, UNM
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. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
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Antonello Petriccione   
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J_Martz   
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Woreczko Jan & Wadi      
Geography:

Mali
Coordinates:
     Recommended::   (21° 38' 20"N, 1° 49' 47"W)

Statistics:
     This is 1 of 30 approved meteorites from Gao, Mali (plus 1 unapproved name)
     This is 1 of 111 approved meteorites from Mali (plus 2 unapproved names)
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