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Erg Chech 009
Basic information Name: Erg Chech 009
     This is an OFFICIAL meteorite name.
Abbreviation: EC 009
Observed fall: No
Year found: 2022
Country: Algeria
Mass:help 10.6 kg
Classification
  history:
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 263 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 23 Jul 2022
Writeuphelp
Writeup from MB 111:

Erg Chech 009 (EC 009)        26.010°N, 1.938°W

Adrar, Algeria

Purchased: 2022 Feb

Classification: HED achondrite (Eucrite, monomict)

History: Found in Algeria and purchased by Ziyao Wang in early 2022 from a dealer in Laayoune, Morocco. The main mass was then purchased in China by Hui Jin and Jiachang Yu in February 2022.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia composed mainly of equant mineral grains (mean grainsize ~0.25 mm) related to a microgabbroic eucrite lithology together with sparse related polymineralic lithic clasts. Major minerals are exsolved pigeonite and calcic plagioclase accompanied by accessory silica polymorph, ilmenite (with zircon inclusions), low-Ti chromite (intergrown with ilmenite) and troilite. No Fe metal was observed.

Geochemistry: Low-Ca pyroxene hosts (Fs60.8-61.4Wo2.6-1.6, FeO/MnO = 33, N = 4), augite exsolution lamellae (Fs26.9-27.5Wo44.5-43.3, FeO/MnO = 33-35, N = 3), plagioclase (An75.2-93.9Or3.2-0.2, N = 4).

Classification: Eucrite (monomict microgabbroic breccia).

Specimens: 79.4 g including a polished endcut at UWB; remainder with Mr. Hui Jin and Mr. Jiachang Yu.

Data from:
  MB111
  Table 0
  Line 0:
State/Prov/County:Adrar
Place of purchase:China
Date:P 2022 Feb
Latitude:26.010°N
Longitude:1.938°W
Mass (g):10600
Pieces:1
Class:Eucrite-mmict
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):60.8-61.9; 26.9-27.5
Wollastonite (mol%):2.6-1.6; 44.5-43.3
Classifier:(A. Irving, UWS and P. Carpenter, WUSL)
Type spec mass (g):79.4
Type spec location:UWB
Main mass:H. Jin/J. Yu
Comments:Work name WZY-89; submitted by A. Irving
Institutions
   and collections
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. 111, in preparation (2022)
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Geography:

Algeria
Coordinates:
     Recommended::   (26° 0' 36"N, 1° 56' 17"W)

Statistics:
     This is 1 of 177 approved meteorites from Adrar, Algeria (plus 1 unapproved name)
     This is 1 of 1208 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)
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