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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
Classification
  history:
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 355 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 10 Jan 2021
Writeuphelp
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:
  MB110
  Table 0
  Line 0:
Place of purchase:Ensisheim, France
Date:P 2009 June 19
Mass (g):331
Pieces:1
Class:Eucrite-pmict
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
Institutions
   and collections		 IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7795 approved meteorites from (Northwest Africa) (plus 1971 unapproved names)

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