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Oudiyat Sbaa
Basic information Name: Oudiyat Sbaa
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: Yes, confirmed fall
Year fell: 2016
Country: Western Sahara
Mass:help 23.85 kg
Classification
  history:
Meteoritical Bulletin:  MB 106  (2018)  EH5
Recommended:  EH5    [explanation]

This is 1 of 7 approved meteorites classified as EH5.   [show all]
Search for other: EH chondrites, Enstatite chondrites, Enstatite chondrites (type 4-7), and Enstatite-rich meteorites
Comments: Approved 21 May 2017
Writeuphelp
Writeup from MB 106:

Oudiyat Sbaa        25.546°N, 12.418°W

Western Sahara/Morocco

Confirmed fall: 2016 Nov 18

Classification: Enstatite chondrite (EH5)

History: On November 18, 2016, at 4:40 pm local time, a bright fireball was witnessed traveling in a southerly direction by many observers in Morocco over an area extending from Tiznit to Guelmim, Tan Tan and Smara. Sonic booms were heard by Mbarek Bouilid, Aitoussi Redwan and three camel shepherds of the Aitboussoula family (who thought that perhaps the sound was caused by explosion of a mine trodden on by a camel). A search for fallen stones was begun, and on November 23 another shepherd (Bachir Alamine) found three black fusion-crusted stones on light brown sandy soil near Oudiyat Sbaa.

Physical characteristics: The stones are completely coated in thin, black fusion crust. The fresh interiors are overall medium gray in color with abundant shiny grains of metal and sulfides. When first found the stones emitted a sulfurous odor.

Petrography: (A. Irving and S. Kuehner, UWS) Some well-formed chondrules (apparent diameter 300±100 μm) are present within a recrystallized matrix containing abundant metal and sulfides. Apart from dominant enstatite, the specimen contains alkali feldspar, Si-bearing kamacite, niningerite, oldhamite, Cr-bearing troilite and schreibersite. A spherical crystalline object (apparent diameter 1.1 mm) observed in one thin section is composed predominantly of fluororichterite associated with a silica polymorph, enstatite and sulfides.

Geochemistry: Enstatite (Fs0.4-0.6Wo0.1-0.3, N = 3), alkali feldspar (Ab88.7-93.1An1.1-0.9Or10.2-6.0, N = 2), metal (Ni 6.2-6.3 wt.%, Co 0.4 wt.%, Si 3.3 wt.%, N = 2). Cosmogenic radionuclides: (Å. Rosén, UBE/NMBE, GeMSE): Gamma-spectroscopy performed in February 2017 showed the presence of the following cosmogenic radionuclides: 46Sc, 56Co, 54Mn, 58Co, 7Be, 48V, 51Cr, 57Co, 22Na, 44Ti and 26Al. Recalculated to 18 November 2016 and assuming average EH chondrite density and composition, 48V was 43.0 (+7.8,-5.2), 22Na was 60.8 (+8.1,-4.6) dpm/kg and 26Al 53.6 (+7.9,-3.4) dpm/kg. The 22Na/26Al activity ratio of 1.1 (+0.2,-0.1) and detected activity of 48V (t1/2=16 d) are consistent with a fall in November 2016. Magnetic susceptibility log χ (× 10-9 m3/kg) = 5.74.

Classification: Enstatite chondrite (EH5).

Specimens: 173.7 g including one polished thin section and a polished thick section at UWB; 17.3 g plus one polished thin section at NMBE; remainder with DPitt.

Data from:
  MB106
  Table 0
  Line 0:
Date:2016 Nov 18
Latitude:25.546°N
Longitude:12.418°W
Mass (g):23845
Pieces:3
Class:EH5
Shock stage:S2
Weathering grade:W0
Ferrosilite (mol%):0.4-0.6
Wollastonite (mol%):0.1-0.3
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):191
Type spec location:UWB/NMBE
Main mass:D. Pitt
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)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
UBE: University of Bern, University of Bern, Hochschulstrasse 4, CH-3012 Bern, Switzerland (institutional address)
Catalogs:
References: Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
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Photos:
CreditPhotos
Public domain photographs:
A. Irving   
Geography:

Western Sahara
Coordinates:
     Recommended::   (25° 32' 46"N, 12° 25' 5"W)

Statistics:
     This is 1 of 208 approved meteorites from Western Sahara (plus 20 unapproved names)
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