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Sidi El Habib 001
Basic information Name: Sidi El Habib 001
     This is an OFFICIAL meteorite name.
Abbreviation: SEH 001
Observed fall: No, but it is possible
Year found: 2021
Country: Algeria
Mass:help 6.39 kg
Classification
  history:
Recommended:  H5-an    [explanation]

This is 1 of 5 approved meteorites classified as H5-an.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 11 Nov 2021
Writeuphelp
Writeup from MB 110:

Sidi El Habib 001 (SEH 001)        24.298°N, 3.745°W

Bordj Badji Mokhtar, Algeria

Find, possible fall: 2020 Dec

Classification: Ordinary chondrite (H5, anomalous)

History: On December 20, 2020, a bright fireball was witnessed in western Algeria by people prospecting for additional material of the Erg Chech 002 meteorite. After searching for two days a group of fresh fusion crusted stones was found at a location close to the Mali border at 24.298°N, 3.745°E and near a well named Hassi el Kounti. All of the collected material was purchased by Ben Hoefnagels in May 2021 from two Moroccan dealers.

Physical characteristics: Fresh fusion crusted stones with broad and shallow regmaglypts. Largest stone is 1.1 kg. Broken surface shows light-colored clasts in a matrix of light grey material. This grey material contains relatively abundant, to 1-mm, bright blue to purple grains of halite. Density of a 34 g stone comprising the two lithologies is 3.77 g/cm3, determined by the glass bead method. Magnetic susceptibility log χ (× 10-9 m3/kg) = 5.17.

Petrography: (L. Garvie, ASU) A sawn and polished 8 × 6 cm slice shows subhedral light-colored clasts, to 2 cm, in a light-grey matrix. Purple to blue crystals are locally abundant in the light-grey matrix: a powder XRD pattern of these crystals is dominated by reflections for halite and minor sylvite. Well-formed, though sparse, chondrules scattered through-out the clast and matrix lithologies, 601±403 micron (n=26), and separated by coarse-grained mineral and chondrule fragments. Chondrules dominated by PO, rare BO, and rare RP. Some unusual chondrule types present including one dominated by olivine-feldspar-chromite in the matrix lithology, and several Na-Al-Si-rich chondrules in the light-colored clast. Element mapping shows the NaCl to be present only in the grey-matrix lithology at all spatial scales from the mm-sized grains to sub-μm inter-grain films. The halite and sylvite are anhedral, though internally show well-developed cubic cleavage, and give the appearance of euhedral grains. A typical 4 × 4-mm-sized area of the halite-rich matrix contains ~8 areal% NaCl. High-resolution BSE images of the matrix show local regions with bright intergranular "veins" that are rich in Fe-Ni-Cl with little to no Na. A 1-mm subhedral ferroan sphalerite with a rim of troilite occurs in one of the probe mounts from the matrix lithology. The grain contains ~23 wt% Fe, close to the composition for rudashevskyite. Examination of the hand specimens shows several ferroan sphalerite grains in the matrix lithology: XRD of one of the grains confirms the sphalerite structure. Interchondrule feldspar is variable in size, though typically 5 to 20 μm. Merrillite and apatite are common in the clasts as grains to 0.5 mm (total 0.2 areal%). Some merrillite grains have veins and mantles of apatite. Element mapping of the light-colored clast shows several Cl hot-spots that are rich in Fe and Ni, but lack Na. Apatite and merrillite grains are more sparse and smaller in the matrix material.

Geochemistry: (L. Garvie, ASU): Halite-bearing lithology Fa19.4±0.5, range Fa18.5-20.4, FeO/MnO=37.5±3.5, n=9; Fs16.8±0.3Wo1.46±0.08, n=14. The halite contains up to 0.1 wt% K, 0.7 wt% Fe, and 0.3 wt% Br. The sylvite contains up to 0.3 wt% Na and up to 0.1 wt% Br. The ferroan sphalerite contains between 21.1 and 23.8 wt% Fe. Light-colored clast 19.2±0.3, range 18.7-19.5, FeO/MnO=37.8±2.2, n=10; Fs16.7±0.1Wo1.44±0.08, n=12.

Classification: H5 (breccia, anomalous). The pervasive presence of primary alkali halides in this meteorite is anomalous, and previously recognized only in Zag and Monahans (1998).

Specimens: ASU - 319.2 g and eight 1-inch polished rounds. The rest is with Ben Hoefnagels.

Data from:
  MB110
  Table 0
  Line 0:
State/Prov/County:Bordj Badji Mokhtar
Place of purchase:Morocco
Date:2020 Dec
Latitude:24.298°N
Longitude:3.745°W
Mass (g):6390
Pieces:~30
Class:H5-an
Shock stage:S2
Weathering grade:W0/1
Magnetic suscept.:5.17
Classifier:L. Garvie, ASU, A. Irving, UWS
Type spec mass (g):319.2 g
Type spec location:ASU
Main mass:B. Hoefnagels
Comments:Work names BH250 and ASU2169; submitted by L. Garvie
Institutions
   and collections
ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
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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Photos:
CreditPhotos
Public domain photographs:
Laurence Garvie         
Geography:

Algeria
Coordinates:
     Recommended::   (24° 17' 53"N, 3° 44' 42"W)

Statistics:
     This is the only approved meteorite from Bordj Badji Mokhtar, Algeria
     This is 1 of 1250 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)
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