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Mhabes el Hamra
Basic information Name: Mhabes el Hamra
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: Yes, probable fall
Year of probable fall: 2018
Country: Mauritania
Mass:help 23.1 kg
Classification
  history:
Recommended:  H4/5    [explanation]

This is 1 of 494 approved meteorites classified as H4/5.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 26 Apr 2019
Writeuphelp
Writeup from MB 108:

Mhabes el Hamra        26.2269568°N, 7.8181461°W

Tiris Zemmour, Mauritania

Probable fall: 2018 Dec 23

Classification: Ordinary chondrite (H4/5)

History: Three shepherds (Salek Mohamed, Sidi Ahmed Taleb and Baji Ayoub) were searching for desert truffles in the Tiris Zemmour region of northern Mauritania on December 23, 2018, when they heard a loud sonic boom at 9:30 am. After 36 hours of searching they found five freshly broken stones which fit together to make one complete stone near the village of Mhabes el Hamra. One week later, all of the material was acquired by Aziz Habibi.

Physical characteristics: The recovered pieces (total weight 23100 g) have black fusion crust on exterior surfaces and light gray interiors with abundant fresh metal visible.

Petrography: (A. Irving and S. Kuehner, UWS) Some well-formed, relatively small chondrules occur within a moderately recrystallized matrix containing abundant metal (kamacite plus taenite) and accessory merrillite. The meteorite is texturally transitional between petrographic types 4 and 5.

Geochemistry: Olivine (Fa18.6-19.1, N = 3), orthopyroxene (Fs15.9-16.2Wo1.1.1-1.4, N = 3), clinopyroxene (Fs5.5.9-6.0Wo45.2-45.0, N = 2), plagioclase (An11.3-14.9Ab83.6-81.6Or5.1-3.5, N = 2). Cosmogenic radionuclides (Å. Rosén, B. Hofmann, NMBE, GeMSE): Gamma-spectroscopy performed January 30 to February 11, 2019, on a 23.82 g sample showed the presence of several short-lived cosmogenic radionuclides: 46Sc, 56Co, 58Co, 7Be ( t1/2= 53 d; 58.9.6+10.4/-8.4 dpm/kg) and 48V (t1/2= 16 d; 22.9+5.7/-2.6 dpm/kg). Recalculated to December 23, 2018, the 22Na/26Al activity ratio is 1.98±0.17. The 26Al activity of 41.6+7.8/-2.1 dpm/kg and absence of detected 60Co (<0.8 dpm/kg) indicates low shielding.

Classification: Ordinary chondrite (H4/5). Cosmogenic radionuclide results confirm that this is a fresh fall.

Specimens: 20.2 g including one polished thin section at UWB; remainder with A. Habibi.

Data from:
  MB108
  Table 0
  Line 0:
State/Prov/County:Tiris Zemmour
Date:2018 Dec 23
Latitude:26.2269568°N
Longitude:7.8181461°W
Mass (g):23100
Pieces:5
Class:H4/5
Shock stage:S2
Weathering grade:W0
Fayalite (mol%):18.6-19.1
Ferrosilite (mol%):15.9-16.2
Wollastonite (mol%):1.1-1.4
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.2
Type spec location:UWB
Main mass:A. Habibi
Finder:S. Mohamed, S. Taleb and B. Ayoub
Comments:Submitted by A. Irving
Institutions
   and collections
NMBE: Natural History Museum Bern Bernastrasse 15 CH-3005 Bern Switzerland, Switzerland; Website (institutional address; updated 2 Mar 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)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
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Photos:
CreditPhotos
Public domain photographs:
A. Irving   
Geography:

Mauritania
Coordinates:
     Recommended::   (26° 13' 37"N, 7° 49' 5"W)

Statistics:
     This is 1 of 9 approved meteorites from Tiris Zemmour, Mauritania (plus 1 impact crater)
     This is 1 of 103 approved meteorites from Mauritania (plus 1 unapproved name) (plus 2 impact craters)
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