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Northwest Africa 13658
Basic information Name: Northwest Africa 13658
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13658
Observed fall: No
Year found: 2009
Country: (Northwest Africa)
Mass:help 331 g
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 383 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 10 Jan 2021
Writeup from MB 110:

Northwest Africa 13658 (NWA 13658)

(Northwest Africa)

Purchased: 2009 June 19

Classification: HED achondrite (Eucrite, polymict)

Petrography: (K. Metzler, IfP) Polymict breccia consisting of basalt clasts with subophitic and gabbroic textures, granulite clasts, and mineral fragments (pyroxene, plagioclase) set in a fine-grained clastic matrix made of related debris. The pyroxene shows augite exsolution lamellae. Accessories are ilmenite, chromite, a silica polymorph, troilite, Ni-poor metal, and zircon.

Geochemistry: Mineral compositions and geochemistry: Gabbroic clast: Low-Ca pyroxene (host): Fs49.7±0.6 Wo1.8±0.3 (Fs49.0-50.5 Wo1.5-2.3); mean Fe/Mn (at.): 34; n=6. Ca-rich pyroxene (exsolution lamellae) Fs20.3±1.4 Wo42.3±1.9 (Fs19.0-22.6 Wo39.1-44.5); n=6. Plagioclase An87.1±0.7 Or0.3±0.3 (An85.8-87.8 Or0.0-0.7); n=6. Granulite clast: Low-Ca pyroxene (host): Fs57.0±0.6 Wo2.0±0.3 (Fs56.2-57.7 Wo1.6-2.4); mean Fe/Mn (at.): 35; n=5. Ca-rich pyroxene (exsolution lamellae) Fs23.8±0.4 Wo43.2±0.5 (Fs23.1-24.2 Wo42.7-44.0); n=6. Plagioclase An88.5±1.0 Or0.2±0.3 (An87.0-90.0 Or0.0-0.6); n=6.

Classification: Polymict eucrite, based on texture, chemical diversity of lithic clasts, 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):331
Shock stage:M-S2
Weathering grade:low
Ferrosilite (mol%):49.7-57.0, 20.3-23.8
Wollastonite (mol%):1.8-2.0, 42.3-43.2
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 8745 approved meteorites from (Northwest Africa) (plus 1880 unapproved names)

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