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El Hassan Ould Hamed 001
Basic information Name: El Hassan Ould Hamed 001
     This is an OFFICIAL meteorite name.
Abbreviation: EHOH 001
Observed fall: No
Year found: 2019
Country: Mauritania
Mass:help 12.16 kg
Classification
  history:
Recommended:  Eucrite-unbr    [explanation]

This is 1 of 98 approved meteorites classified as Eucrite-unbr.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 18 Jul 2020
Writeuphelp
Writeup from MB 109:

El Hassan Ould Hamed 001 (EHOH 001)        25.229°N, 08.624°W

Tiris Zemmour, Mauritania

Find: 2019 Dec

Classification: HED achondrite (Eucrite, unbrecciated)

History: Found in December 2019 at a site NE of Imourene, Mauritania, and purchased a few weeks later by Mohamed Brahim Sueilem and Naji Ben Faraji from a dealer in Tindouf, Algeria.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Fresh protogranular gabbroic assemblage (grainsize up to 3.4 mm) of predominantly exsolved pigeonite and calcic plagioclase, together with accessory silica polymorph, Ti-Al-chromite, ilmenite, baddeleyite, zircon and troilite. Host low-Ca pyroxene in pyroxene grains exhibits distinctive polysynthetic twinning. Chromite and ilmenite grains occur mainly as inclusions within pyroxenes.

Geochemistry: Low-Ca pyroxene host (Fs57.2-59.0Wo5.3-4.1, FeO/MnO = 29-33, N = 4), augite exsolution lamellae (Fs26.6-27.1Wo42.5-43.4, FeO/MnO = 29-31, N = 4), plagioclase (An89.2-90.7Or0.4-0.3, N = 3). Oxygen isotopes (K. Ziegler, UNM): analyses of acid-washed subsamples by laser fluorination gave, respectively, δ17O 1.652, 1.812, 1.789; δ18O 3.676, 3.963, 3.944; Δ17O -0.289, -0.280, -0.293 per mil.

Classification: Eucrite (unbrecciated, gabbroic, protogranular).

Specimens: 20.3 g including one polished thin section at UWB; remainder with Mr. N. Ben Faraji.

Data from:
  MB109
  Table 0
  Line 0:
State/Prov/County:Tiris Zemmour
Origin or pseudonym:Imourene
Place of purchase:Tindouf, Algeria
Date:2019 Dec
Latitude:25.229°N
Longitude:08.624°W
Mass (g):12164
Pieces:1
Class:Eucrite-unbr
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):57.8-59.0; 26.6-27.1
Wollastonite (mol%):5.3-4.1; 42.5-43.4
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):20.3
Type spec location:UWB
Main mass:M. Brahim Sueilem and N. Ben Faraji
Comments:Work name MN X01; submitted by A. Irving
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)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Geography:

Mauritania
Coordinates:
     Recommended::   (25° 13' 44"N, 8° 37' 26"W)

Statistics:
     This is 1 of 10 approved meteorites from Tiris Zemmour, Mauritania (plus 1 impact crater)
     This is 1 of 118 approved meteorites from Mauritania (plus 1 unapproved name) (plus 2 impact craters)
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