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Northwest Africa 13745
Basic information Name: Northwest Africa 13745
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13745
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 1094 g
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 272 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 13 Feb 2021
Writeup from MB 110:

Northwest Africa 13745 (NWA 13745)

(Northwest Africa)

Purchased: 2020 Nov

Classification: HED achondrite (Eucrite, monomict)

History: Purchased from a group of Saharawi meteorite hunters in Nouadhibou, Mauritania.

Physical characteristics: Many meteorite fragments (main mass 469 g) without fusion crust.

Petrography: (K. Metzler, IfP) Monomict breccia consisting of basaltic lithic clasts with ophitic to subophitic textures and monomineralic fragments (pyroxene, plagioclase) set in a fine-grained clastic matrix of related debris. The lithic clasts are recrystallized, with frequent 120° triple junctions between mineral grains. Augite exsolution lamellae in low-Ca pyroxene and vice versa. Accessories are a silica polymorph, ilmenite, chromite, and traces of troilite and Ni-poor metal. One Fe-rich olivine grain was observed in a basalt clast. The sample is heavily shocked; all plagioclase has been transformed into maskelynite.

Geochemistry: Mineral compositions and geochemistry: Low-Ca pyroxene: Fs69.7±0.5 Wo2.3±0.3 (Fs68.7-70.4 Wo1.9-2.8); mean Fe/Mn (at.): 32; n=12. Ca-rich pyroxene: Fs33.4±1.1 Wo42.0±0.6 (Fs31.8-35.2 Wo40.7-42.8); n=12. Plagioclase (maskelynite): An81.7±2.3 Or0.5±0.4 (An77.7-86.3 Or0.0-0.9); n=12. Olivine: Fa85; Fe/Mn (at.): 43.

Classification: Monomictly brecciated eucrite with highly ferroan pyroxene. Heavily shocked, with plagioclase completely transformed into diaplectic glass (maskelynite).

Data from:
  Table 0
  Line 0:
Place of purchase:Nouadhibou, Mauritania
Date:P 2020 Nov
Mass (g):1094
Shock stage:M-S4
Weathering grade:moderate
Fayalite (mol%):85.1
Ferrosilite (mol%):69.7±0.5; 33.4±1.1
Wollastonite (mol%):2.3±0.3; 42.0±0.6
Classifier:K. Metzler, IfP
Type spec mass (g):20
Type spec location:IfP
Main mass:Salamu Ali, Stockholm, Sweden
Comments:Submitted by K. Metzler, IfP
   and collections
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
References: Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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     This is 1 of 8890 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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