|Basic information||Name: Aouinet Legraa|
This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: Yes, probable fall
Year of probable fall: 2013
Mass: 58 kg
This is 1 of 64 approved meteorites classified as Eucrite-unbr. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
|Comments:||Approved 11 Jun 2016|
Writeup from MB 105:
Aouinet Legraa 27.120°N, 7.018°W
Probable fall: 2013 July
Classification: HED achondrite (Eucrite, unbrecciated)
History: An extremely bright fireball was seen by several persons as it moved in an easterly direction over western Algeria in the vicinity of Tindouf at approximately 11 pm on July 17, 2013. No sonic phenomena were documented. Sightings were also made by residents in the Algerian village of Oum el Assel. A search for meteorites was initiated soon after the event, but it was not until April 2014 that a strewnfield was located at 27.120°N, 7.018°W. Subsequently, many fusion-crusted stones were purchased in May 2014 from the finders by Darryl Pitt.
Physical characteristics: Fresh stones coated by black fusion crust with numerous anastomozing ridges. Interiors are notable for the bright internal reflections within vitreous plagioclase laths and the unusually abundant, accessory, bronze-colored sulfides.
Petrography: (A. Irving and S. Kuehner, UWS) Two studied stones have a subophitic diabasic texture, and exhibit no evidence of deformation or terrestrial alteration. Composed of prismatic exsolved pigeonite grains and calcic plagioclase laths with accessory silica polymorph, Ti-rich chromite, Ti-poor chromite, troilite and ilmenite, plus rare zircon and Ni-free metal.
Geochemistry: Low-Ca pyroxene host (Fs57.1-58.0Wo6.2-6.7, FeO/MnO = 29-30, N = 3), high-Ca pyroxene exsolution lamellae (Fs28.1-29.3Wo42.0-41.6, FeO/MnO = 29-31, N = 3), high-Ca pyroxene host (Fs28.1Wo42.3, FeO/MnO = 31), low-Ca pyroxene exsolution lamella (Fs57.6Wo6.4, FeO/MnO = 31), plagioclase (An93.2-94.5Or0.7-0.5, N = 4). Magnetic susceptibility, log χ (× 10-9 m3/kg) = 2.95.
Classification: Eucrite (diabasic, unbrecciated).
Specimens: 43 g including two polished thin sections at UWB; 51.7 kg (including a 35.9 kg mass) with DPitt and the remainder with anonymous collectors.
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)
|References:||Published in Meteoritical Bulletin, no. 105, in preparation (2016)|
This is 1 of 29 approved meteorites from Tindouf, Algeria (plus 1 impact crater)
This is 1 of 728 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)
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