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El Milhas 001
Basic information Name: El Milhas 001
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2022
Country: Mauritania
Mass:help 385 g
Classification
  history:
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 280 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 6 Aug 2022
Writeuphelp
Writeup from MB 111:

El Milhas 001        25.684°N, 7.173°W

Tiris Zemmour, Mauritania

Find: 2022 Apr

Classification: Lunar meteorite (feldspathic breccia)

History: Two similar-appearing stones were found together in Mauritania in April 2022 at 25.684°N, 7.173°W and were subsequently purchased by Jason Phillips and James Tobin from a Mauritanian dealer in May 2022.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia composed of mineral clasts of anorthite, olivine (with a wide compositional range), low-Ca pyroxene, unexsolved pigeonite, exsolved pigeonite and augite, together with some troctolitic lithic clasts, in a fine grained matrix containing taenite, pentlandite and troilite. The troctolitic clasts are composed predominantly of Mg-rich olivine and anorthite in distinct monomineralic layers.

Geochemistry: Anorthite (An96.3-97.6Or0.0, N = 3), olivine (Fa12.2-54.9, FeO/MnO = 94-99, N = 4), low-Ca pyroxene (Fs10.2-10.3Wo4.4-4.8, FeO/MnO = 52-57, N = 2), pigeonite (Fs23.1-23.9Wo10.7-7.9, FeO/MnO = 56-60, N = 2), augite exsolution lamellae (Fs5.3-5.4Wo43.1-43.0, FeO/MnO = 31-38, N = 2), pigeonite exsolution lamella (Fs11.6Wo7.0, FeO/MnO = 59), augite (Fs10.2Wo42.3, FeO/MnO = 39; Fs21.7Wo37.6, FeO/MnO = 61; N = 2).

Classification: Lunar (feldspathic breccia).

Specimens: 24.8 g in the form of a polished endcut at UWB; remainder held jointly by Mr. J. Phillips and Mr. J. Tobin.

Data from:
  MB111
  Table 0
  Line 0:
State/Prov/County:Tiris Zemmour
Place of purchase:Mauritania
Date:2022 Apr
Latitude:25.684°N
Longitude:7.173°W
Mass (g):385.3
Pieces:2
Class:Lunar (feldsp. breccia)
Shock stage:low
Weathering grade:low
Fayalite (mol%):12.2-54.9
Ferrosilite (mol%):10.2-10.3; 23.1-23.9; 10.2; 21.7
Wollastonite (mol%):4.4-4.8; 7.9-10.7; 37.6-42.3
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):24.8
Type spec location:UWB
Main mass:J. Phillips and J. Tobin
Comments:Work name JP22-1; 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)
Tobin: J. Tobin, The Meteorite Exchange, PMB #455, P.O. Box 7000, Redondo Beach, CA 90277, United States (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
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Geography:

Mauritania
Coordinates:
     Recommended::   (25° 41' 2"N, 7° 10' 23"W)

Statistics:
     This is 1 of 14 approved meteorites from Tiris Zemmour, Mauritania (plus 1 impact crater)
     This is 1 of 176 approved meteorites from Mauritania (plus 1 unapproved name) (plus 2 impact craters)
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