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Northwest Africa 8771
Basic information Name: Northwest Africa 8771
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8771
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 29 g
Classification
  history:
Meteoritical Bulletin:  MB 104  (2015)  CO3
Recommended:  CO3    [explanation]

This is 1 of 523 approved meteorites classified as CO3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites
Comments: Approved 13 Feb 2015
Writeuphelp
Writeup from MB 104:

Northwest Africa 8771 (NWA 8771)

(Northwest Africa)

Purchased: 2011

Classification: Carbonaceous chondrite (CO3)

History: The meteorite was purchased in 2011 at a mineral fair in Ensisheim, France.

Petrography: The meteorite displays a brownish interior and is composed of abundant small chondrules (0.1-0.3 mm in diameter), mineral fragments and rare CAIs set into a fine-grainded matrix. Chondrules are dominantly of PO type and sometimes surrounded by accretionary rims. The meteorite is severely weathered and shows intense brownish-orange staining.

Geochemistry: Oxygen isotopes (K. Ziegler, UNM): acid-washed material analyzed in replicate by laser fluorination gave, respectively: δ18O=-4.679, -5.888, -4.436, -5.499; δ17O=-8.838, -9.427, -7.644, -8.934; Δ17O=-6.367, -6.318, -5.302, -6.031 (all per mil).

Data from:
  MB104
  Table 0
  Line 0:
Place of purchase:Ensisheim, France
Date:P 2011
Mass (g):29
Pieces:1
Class:CO3
Shock stage:S1
Weathering grade:W4
Fayalite (mol%):20±16.7 (0.8-48.5, n=30)
Ferrosilite (mol%):2.3±0.7 (1.2-3, n=10)
Wollastonite (mol%):2.8±0.9 (1.5-3.9, n=10)
Classifier:A. Greshake, MNB
Type spec mass (g):5.9
Type spec location:MNB
Main mass:Marcin Cimala
Comments:Submitted by Ansgar Greshake
Plots: O isotopes:  
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstrasse 43, D-10115 Berlin, Germany (institutional address)
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
Catalogs:
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7005 approved meteorites from (Northwest Africa) (plus 2002 unapproved names)

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