header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 27 Nov 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 15254
Basic information Name: Northwest Africa 15254
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15254
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 980 g
Classification
  history:
Recommended:  CO3    [explanation]

This is 1 of 616 approved meteorites (plus 1 unapproved name) classified as CO3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites
Comments: Approved 14 Sep 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 15254 (NWA 15254)

(Northwest Africa)

Purchased: 2022

Classification: Carbonaceous chondrite (CO3)

History: Many samples different sizes (410 g) were found in northwest Africa. Adrián Contreras Gómez (CRATER) purchased the samples from the Saharawi meteorite dealer Yahdih Buhali Omar in July 2022.

Physical characteristics: An irregularly shaped, dark-brown fragment shows a polished face where numerous small chondrules are observed.

Petrography: Description and classification (A. Love, App) Sample shows numerous chondrules, AOAs, CAIs and grains of FeNi metal set within a fine-grained ferroan matrix. Chondrules have an average apparent diameter of 234 μm (n=59). Additional minerals are: plagioclase, troilite, rare phosphate and chromite.

Geochemistry: (A. Love, App) Olivine (Fa10.6±15.6, Fe/Mn=89.4±15.6, n=28, Cr2O3 in olivine (Fa>2)=0.13±0.06, n=19); low Ca pyroxene (Fs2.0±1.0Wo1.3±1.0, Fe/Mn=16.7±7.0, n=8).

Classification: Carbonaceous chondrite (CO3, C-S2, W2) Based on chondrule diameters, presence of CAIs and mineral compositions, sample is a CO3. Based on mean and SD of Cr2O3 of ferroan olivine chondrules (0.13±0.06), estimated petrologic sub type is 3.2.

Specimens: Adrián Contreras Gómez (Crater Meteorites) holds the main masses. A 33.29 g windowed individual and a polished thin section are on deposit at App.

Data from:
  MB111
  Table 0
  Line 0:
Date:P 2022
Mass (g):980
Pieces:Many
Class:CO3
Shock stage:C-S2
Weathering grade:W2
Fayalite (mol%):10.6±15.6
Ferrosilite (mol%):2.0±1.0
Wollastonite (mol%):1.3±1.0
Magnetic suscept.:4.58
Classifier:A. Love, App
Type spec mass (g):33.29
Type spec location:App
Main mass:Adrián Contreras Gómez (CRATER Meteorites)
Comments:Submitted by Anthony Love
Institutions
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
Catalogs:
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8745 approved meteorites from (Northwest Africa) (plus 1880 unapproved names)

Direct link to this page