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Sidi Ali Ou Azza
Basic information Name: Sidi Ali Ou Azza
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: Yes, confirmed fall
Year fell: 2015
Country: Morocco
Mass:help 1500 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  L4
Recommended:  L4    [explanation]

This is 1 of 1617 approved meteorites (plus 4 unapproved names) classified as L4.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 22 Feb 2016
Writeuphelp
Writeup from MB 105:

Sidi Ali Ou Azza        29°47’2.9"N, 7°23’21.8"W

Guelmim-Es-Semara, Morocco

Confirmed fall: 28 Jul 2015

Classification: Ordinary chondrite (L4)

History: (H. Chennaoui Aoudjehane FSAC, A. Aaranson, A. Bouragaa, A. Bouferra). On Tuesday, 28 July 2015, around 5:30 pm local time (6:30 pm GMT), many people from Tissint and its vicinity heard three sonic booms in the direction of Sidi Ali Ou Azza. Immediately, numerous people begin searching for the meteorite in the area. Two days after the fall, many small pieces from 5 to 109 g (so far: 109, 100, 75, 50, 40, 37, 20, 10, 7, and 5.7 g) were recovered close to Sidi Ali Ou Azza and El Kharoua’ well, a few km west of Tissint. Most pieces are complete and mostly covered by black fusion crust. The interior is dark and brecciated, with a few clear gray zones. Numerous small and well-defined chondrules are visible as well as sulfides and metals. The direction of the fall was from north to south; the strewnfield is ~4 km long.

Physical characteristics: Black and brown patchy fusion crust. A saw cut reveals numerous, distinct chondrules and fine grained metal/sulfide. A dark angular clast, ~5 mm, was also observed.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows numerous porphyritic chondrules, a few BO chondrules, and an enstatite-rich chondrule. Mesostasis and very fine-grained plagioclase is ubiquitous. Kamacite, taenite, troilite, chromite, and a phosphate phase were observed throughout. The dark angular clast described above has an igneous texture with ~50% zoned euhedral olivines (up to 50 μm) and ~50% fine spinifex quench crystals, with sparse scattered metal or sulfide blebs (up to 10 μm).

Geochemistry: (C. Agee and N. Muttik, UNM) Chondrule olivine Fa25.7±0.9, Fe/Mn=50±3, Cr2O3=0.03±0.03 (wt%), n=24; chondrule low-Ca pyroxene Fa20.4±1.7, Fe/Mn=29±1, n=10; chondrule enstatite Fs2.1±0.2Wo0.6±0.2, n=2; plagioclase An8.3±3.9Ab86.9±3.1Or4.9±0.9. Clast olivine Fa19.3±4.1, Fe/Mn=47±4, Cr2O3=0.45±0.21 (wt%), n=6.

Classification: Ordinary chondrite, L4

Specimens: 20.8 g, UNM; 10.7 g, FSAC

Data from:
  MB105
  Table 0
  Line 0:
State/Prov/County:Guelmim-Es-Semara
Date:28 Jul 2015
Latitude:29°47'2.9"N
Longitude:7°23'21.8"W
Mass (g):1500
Pieces:Many
Class:L4
Shock stage:S3
Weathering grade:W0
Fayalite (mol%):25.7±0.9
Ferrosilite (mol%):20.4±1.7
Wollastonite (mol%):1.3±0.6
Magnetic suscept.:4.8
Classifier:C. Agee, UNM; H. Chennaoui Aoudjehane, FSAC
Type spec mass (g):20.8 + 10.7
Type spec location:UNM, FSAC
Main mass:Aaronson
Finder:L. Labkem, L. Karouach, A. Taghlaoui
Comments:Submitted by H. Chennaoui Aoudjehane
Institutions
   and collections
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
FSAC: Universite Hassan II Casablanca, Faculte des Sciences Ain Chock, Departement de Géologie, BP 5366 Maârif, Casablanca, Morocco (institutional address; updated 9 Jan 2013)
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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Photos:
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    (Caution, these are of unknown reliability)
Denis gourgues               
METEORITICON      
Woreczko Jan & Wadi   
Geography:

Morocco
Coordinates:
     Recommended::   (29° 47' 3"N, 7° 23' 22"W)

Statistics:
     This is 1 of 16 approved meteorites from Guelmim-Es-Semara, Morocco (plus 2 unapproved names)
     This is 1 of 1406 approved meteorites from Morocco (plus 16 unapproved names) (plus 1 impact crater)
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