header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 6 Aug 2022
Search for: Search type: Search limits: Display: Publication:
Names
Text help
Places
Classes
Years
Contains
Starts with
Exact
Sounds like
NonAntarctic
Falls  Non-NWAs
What's new
  in the last:
Include past classifications in search
Limit to approved meteorite names
Search text:  
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
Classification
  history:
Recommended:  Lunar (Feldsp. breccia)    [explanation]

This is 1 of 280 approved meteorites classified as Lunar (Feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 31 Oct 2021
Writeuphelp
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:
  MB110
  Table 0
  Line 0:
Place of purchase:Nouadhibou, Mauritania
Date:P 2021 Jun
Mass (g):668
Pieces:1
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
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:
Photos:
CreditPhotos
Public domain photographs:
Knut Metzler         
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8559 approved meteorites from (Northwest Africa) (plus 1896 unapproved names)

Direct link to this page