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Northwest Africa 14258
Basic information Name: Northwest Africa 14258
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14258
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 668 g
Meteoritical Bulletin:  MB 110  (2022)  Lunar (Feldsp. breccia)
Recommended:  Lunar (Feldsp. breccia)    [explanation]

This is 1 of 341 approved meteorites classified as Lunar (Feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 31 Oct 2021
Writeup from MB 110:

Northwest Africa 14258 (NWA 14258)

(Northwest Africa)

Purchased: 2021 Jun

Classification: Lunar meteorite (feldspathic breccia)

Physical characteristics: A single stone without fusion crust and some caliche on its surface. The interior appears medium gray with small dark and whitish clasts.

Petrography: (K. Metzler, IfP) Fine-grained polymict achondritic breccia, consisting of small lithic clasts (up to 7 mm) and mineral fragments (mainly plagioclase, olivine, and pyroxene) set in a compacted fine-grained clastic matrix of related debris. The clastic matrix is intermingled with small amounts of crystallized vesicular melt. Lithic clast types: fine-grained subophitic basalt, olivine gabbro, fragment-rich impact melt rock, and impact glass. Accessories are ilmenite, chromite, troilite, and Ni-bearing metallic iron (~Fe93Ni7).

Geochemistry: Mineral compositions and geochemistry: Mean olivine composition: Fa31.9±7.8 (Fa21.4-42.6); Fe/Mn (at.): 96.4±23.4 (62-122); n=10. Mean pyroxene composition Fs23.1±4.3 Wo4.1±1.2 (Fs18.0-29.9 Wo2.6-6.3); Fe/Mn (at.): 55.0±13.2 (42-75); n=6. Plagioclase An97.0±0.8 (An95.5-98.1); n=13. Chemistry of an impact glass spherule (wt%): SiO2=44.3; Al2O3=27.4; CaO=16.1; FeO=5.3; MgO=5.1; Na2O=0.5; TiO2=0.4; Cr2O3=0.2; MnO=0.08.

Classification: Lunar feldspathic breccia

Data from:
  Table 0
  Line 0:
Place of purchase:Nouadhibou, Mauritania
Date:P 2021 Jun
Mass (g):668
Class:Lunar (Feldsp. breccia)
Shock stage:M-S2
Weathering grade:Low
Fayalite (mol%):31.9±7.8
Ferrosilite (mol%):23.1±4.3
Wollastonite (mol%):4.1±1.2
Classifier:K. Metzler, IfP
Type spec mass (g):20
Type spec location:IfP
Main mass:Andreas Schefzig
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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Public domain photographs:
Knut Metzler         

     This is 1 of 9729 approved meteorites from (Northwest Africa) (plus 1859 unapproved names)

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