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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 263 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 Meteoritical Bulletin, no. 110, in preparation (2021)
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     This is 1 of 8559 approved meteorites from (Northwest Africa) (plus 1896 unapproved names)

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