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Northwest Africa 14599
Basic information Name: Northwest Africa 14599
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14599
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 500 g
Meteoritical Bulletin:  MB 111  (2023)  Mesosiderite-A2/3
Recommended:  Mesosiderite-A2/3    [explanation]

This is the only approved meteorite classified as Mesosiderite-A2/3.
Search for other: Class A mesosiderites, Mesosiderites, and Metal-rich meteorites
Comments: Approved 29 Jan 2022
Writeup from MB 111:

Northwest Africa 14599 (NWA 14599)

(Northwest Africa)

Purchased: January 2021

Classification: Mesosiderite-A2/3

History: Purchased in January 2021 by Yang Shun-Chung and Juan Chen from Ali Mtah in Tindouf, Algeria.

Physical characteristics: Single stone with slightly weathered fusion crust. A slice from the interior reveals a metal-rich surface.

Petrography: (D. Sheikh, Cascadia) Specimen represents a breccia primarily composed of angular to sub-rounded silicate lithic and mineral clasts (Av. 1 mm, up to 4 mm) and sub-rounded to rounded segregated domains of Fe-Ni metal (Av. 2 mm, up to 5 mm, ~25 % in studied thin section) set within a fine-grained fragmental matrix (~ 0.1 mm) composed of sub-angular to sub-rounded silicate grains and rounded blebs of Fe-Ni metal. The silicate portion (~75 % in studied thin section) consists of ~70 % pyroxene (some are poikiloblastic), ~24 % plagioclase, ~4 % silica, ~2 % olivine, and ~<1 % accessory troilite and chromite. Metal is relatively fresh with only a few weathering veins dispersed throughout the sample.

Geochemistry: Olivine (Fa31.4±2.3, range Fa29.3-34.3, FeO/MnO=49±5, n=4), Low-Ca Pyroxene (Fs27.1±4.2Wo3.2±1.2, range Fs23.1-33.2Wo2.0-4.8, FeO/MnO=35±4, n=7), Pigeonite (Fs31.1±1.6Wo7.7±0.7, range Fs28.9-33.2Wo6.9-8.8, FeO/MnO=34±5, n=5), Calcic Plagioclase (An95.2±2.9Or0.2±0.2, range An89.2-97.4Or0.1-0.8, n=11).

Classification: Mesosiderite-A2/3. Estimated modal abundance of plagioclase consistent with petrologic class A. Grade 2/3 is estimated due to this sample displaying textural characteristics consistent with both grade 2 (recognizable brecciation in thin section, presence of extremely fine-grained silicate grains (<10 μm) within the matrix, partial replacement of olivine by pyroxene, partial inversion of pigeonite to orthopyroxene) and grade 3 (Average matrix grain size of 0.1 mm, presence of poikiloblastic pyroxene grains, presence of segregated domains of Fe-Ni metal).

Specimens: 22.1 g at NHMLAC; main mass with Yang Shun-Chung and Juan Chen.

Data from:
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P January 2021
Mass (g):500
Shock stage:low
Weathering grade:low
Fayalite (mol%):31.4±2.3
Ferrosilite (mol%):27.1±4.2, 31.1±1.6
Wollastonite (mol%):3.2±1.2, 7.7±0.7
Classifier:D. Sheikh, Cascadia
Type spec mass (g):22.1
Type spec location:NHMLAC
Main mass:Yang Shun-Chung and Juan Chen
Comments:Submitted by Daniel Sheikh
   and collections
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
NHMLAC: Natural History Museum of Los Angeles County 900 Exposition Blvd., Los Angeles, CA 90007 , United States; Website (institutional address; updated 17 Jul 2021)
References: Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
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     This is 1 of 9790 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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