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El Milhas 005
Basic information Name: El Milhas 005
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2023
Country: Mauritania
Mass:help 1272 g
Classification
  history:
Meteoritical Bulletin:  MB 112  (2023)  Mesosiderite-A3
Recommended:  Mesosiderite-A3    [explanation]

This is 1 of 15 approved meteorites classified as Mesosiderite-A3.   [show all]
Search for other: Class A mesosiderites, Mesosiderites, and Metal-rich meteorites
Comments: Approved 13 Nov 2023
Writeuphelp
Writeup from MB 112:

El Milhas 005        25.433804, -5.922480

Tiris Zemmour, Mauritania

Find: 2022

Classification: Mesosiderite (group A3)

History: This meteorite was found in northern Mauritania, October 2022, about 15 km northwest of Chegga. Purchased by Brett Joseph Cohen in 2023.

Physical characteristics: Saw cut slice reveals numerous irregular but distinctly segregated metal domains >1 mm. Disseminated, fine-grained metal is absent. Metal appears fresh with little oxidation. Some larger pyroxene poikiloblasts up to 1-cm are visible in a finer grained silicate groundmass. Macroscopically, the approximate modal abundances are ~70% silicates and ~30% metals and opaques.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows approximately 25% plagioclase present. There is also minor but ubiquitous silica throughout, mostly in the form of blade-like crystals. Minor troilite was detected. No olivine was found. Both kamacite and taenite are present. No brecciation observed.

Geochemistry: (M.Spilde, UNM) Low-Ca pyroxene Fs29.3±7.7Wo4.9±3.7, Fe/Mn=28±3, n=8; plagioclase An90.9±4.2Ab8.6±3.9Or0.5±0.3, n=5.

Classification: Mesosiderite-A3. Relatively high abundance of plagioclase and silica consistent with group A. Segregated metal, presence of some texturally and chemically equilibrated silicates, and absence of brecciation consistent with type 3.

Specimens: 23 g on deposit at UNM, Brett Joseph Cohen holds the main mass.

Data from:
  MB112
  Table 0
  Line 0:
State/Prov/County:Tiris Zemmour
Date:2022
Latitude:25.433804
Longitude:-5.922480
Mass (g):1272
Pieces:1
Class:Mesosiderite-A3
Shock stage:low
Weathering grade:moderate
Ferrosilite (mol%):29.3±7.7
Wollastonite (mol%):4.9±3.7
Classifier:C. Agee, UNM
Type spec mass (g):23
Type spec location:UNM
Main mass:Brett Joseph Cohen
Comments:Fieldname BJC-1; submitted by C. Agee
Institutions
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
Catalogs:
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
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Geography:

Mauritania
Coordinates:
     Recommended::   (25° 26' 2"N, 5° 55' 21"W)

Statistics:
     This is 1 of 30 approved meteorites from Tiris Zemmour, Mauritania (plus 1 impact crater)
     This is 1 of 225 approved meteorites from Mauritania (plus 2 unapproved names) (plus 2 impact craters)
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