header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 30 Nov 2019
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 10881
Basic information Name: Northwest Africa 10881
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10881
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 835 g
Classification
  history:
Meteoritical Bulletin:  MB 106  (2018)  CO3.0
Recommended:  CO3.0    [explanation]

This is 1 of 21 approved meteorites classified as CO3.0.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites
Comments: Approved 1 Jul 2017
Writeuphelp
Writeup from MB 106:

Northwest Africa 10881 (NWA 10881)

(Northwest Africa)

Purchased: 2015

Classification: Carbonaceous chondrite (CO3.0)

History: Purchased by Mohammed Hmani in 2015.

Physical characteristics: Single stone. Weathered fusion crust exterior. A saw cut reveals many very small chondrules and a few small CAIs set in a dark brown matrix.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows numerous chondrules, many fragmental or irregular, most in the size range 50-200 μm. Scattered matrix olivines and CAIs were observed throughout. Fine grained matrix makes up approximately 50% of this meteorite. The metal abundance is low. The CAIs are small and scattered.

Geochemistry: (C. Agee and M. Spilde, UNM) All olivine Fa11.0±15.3, n=30; coarse ferroan olivine Fa28.7±11.6, Fe/Mn=119±66, Cr2O3=0.38±0.08 (wt%), n=11; enstatite Fs2.4±1.9Wo1.3±0.7, n=8; diopside Fs3.6±3.8Wo41.4±6.0, n=3; (K. Ziegler, UNM) Oxygen isotope mean values of analyses on 3 acid-washed fragments of bulk sample, 1.2, 1.5, 1.5 mg, gave δ17O= -7.053, -4.062, -4.822, δ18O= -2.269, 1.814, -0.062, Δ17O= -5.855, -5.020, -4.789, (linearized, all permil). One of the fragments had O-isotopes near the CO field, the other two were more in the CV/CK field.

Classification: Carbonaceous chondrite (CO3.0), type 3.0 based on mean value and sigma of Cr2O3 in ferroan olivine (Grossman and Brearley, 2005), the values are similar to ALHA77307.

Specimens: 29.8 g including a probe mount on deposit at UNM, Mohammed Hmani holds the main mass.

Bibliography:
  • Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci. 40, 87-122. (link)
Data from:
  MB106
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2015
Mass (g):835
Pieces:1
Class:CO3.0
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):11.0±15.3
Ferrosilite (mol%):2.4±1.9, 3.6±3.8
Wollastonite (mol%):1.3±0.7, 41.4±6.0
Classifier:C. Agee, UNM
Type spec mass (g):29.8
Type spec location:UNM
Main mass:Mohammed Hmani
Comments:Submitted by C. Agee
Plots: O isotopes:  
Institutions
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
Hmani: A. Hmani Moroccan Imports, 13 rue Jules Hardouin Mansart, 92600 Asnières, France (private address)
Catalogs:
References: Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Carl Agee      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7035 approved meteorites from (Northwest Africa) (plus 2000 unapproved names)

Direct link to this page