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Northwest Africa 13657
Basic information Name: Northwest Africa 13657
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13657
Observed fall: No
Year found: 2009
Country: (Northwest Africa)
Mass:help 321 g
Recommended:  Eucrite-melt breccia    [explanation]

This is 1 of 90 approved meteorites classified as Eucrite-melt breccia.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 10 Jan 2021
Writeup from MB 110:

Northwest Africa 13657 (NWA 13657)

(Northwest Africa)

Purchased: 2009 June 19

Classification: HED achondrite (Eucrite, melt breccia)

Petrography: (K. Metzler, IfP) Coarse-grained basalt clasts (up to cm-size) with ophitic to subophitic textures and mineral fragments (pyroxene, plagioclase,) are set in small amounts of black matrix (fine-grained crystallized melt). Pyroxene in the clasts shows exsolution lamellae. Accessories are ilmenite, troilite, a silica polymorph, spinel, and zircon.

Geochemistry: Mineral compositions and geochemistry: Low-Ca pyroxene (host): Fs63.3±0.8 Wo2.3±0.3 (Fs61.4-64.5 Wo2.0-2.9); mean Fe/Mn (at.): 34; n=14. Ca-rich pyroxene (exsolution lamellae) Fs28.3±0.7 Wo42.5±0.7 (Fs27.2-29.6 Wo41.2-43.6); n=14. Plagioclase An87.5±2.3 Or0.3±0.4 (An81.7-90.1 Or0.0-0.9); n=11.

Classification: Achondrite (eucrite-melt breccia). Classification based on texture, mineral compositions, and Fe/Mn ratio of low-Ca pyroxene.

Data from:
  Table 0
  Line 0:
Place of purchase:Ensisheim, France
Date:P 2009 June 19
Mass (g):321
Class:Eucrite-melt breccia
Shock stage:M-S2
Weathering grade:low
Ferrosilite (mol%):63.3±0.8, 28.3±0.7
Wollastonite (mol%):2.3±0.3, 42.5±0.7
Classifier:K. Metzler, IfP
Type spec mass (g):20
Type spec location:IfP
Main mass:anonymous
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 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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