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Northwest Africa 8785
Basic information Name: Northwest Africa 8785
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8785
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 63.5 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  EL3
Recommended:  EL3    [explanation]

This is 1 of 23 approved meteorites classified as EL3.   [show all]
Search for other: EL chondrites, Enstatite chondrites, Enstatite chondrites (type 3), and Enstatite-rich meteorites
Comments: Approved 19 Apr 2016
Writeuphelp
Writeup from MB 105:

Northwest Africa 8785 (NWA 8785)

(Northwest Africa)

Purchased: 2014 Jan

Classification: Enstatite chondrite (EL3)

History: Purchased by Fabien Kuntz in January 2014 from a dealer in Rissani, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Well-formed, spherical chondrules are set in a dark, deep red-brown matrix (~40 vol.%). Minerals are orthopyroxene, forsterite, silica polymorph (with enstatite in chondrules), kamacite, troilite (some Cr-bearing), Al-Ti-bearing diopside, schreibersite and minor calcite and gypsum (probably representing altered oldhamite). No CAI were found.

Geochemistry: Olivine (Fa0.2-1.0, Cr2O3 = 0.01-0.28 wt.%, mean 0.15±0.09 wt.%, N = 18), orthopyroxene (Fs0.1-14.9Wo0.1-2.6, N = 17), diopside (Fs0.4-0.5Wo42.9-42.1, Al2O3 6.9-7.5 wt.%, TiO2 1.2-1.0 wt.%, N = 2), metal (Si 0.7 wt.%, Ni 7.1 wt.%, Co 0.5 wt.%, N = 2). Oxygen isotopes (K. Ziegler, UNM): analyses of four acid-washed subsamples by laser fluorination gave, respectively, δ17O 3.180, 2.880, 2.996, 2.922; δ18O 6.042, 5.707, 5.820, 5.849; Δ17O -0.010, -0.133, -0.077, -0.166 (all per mil).

Classification: Enstatite chondrite (EL3). Matrix is unusually abundant for an enstatite chondrite.

Specimens: 12.86 g including one polished thin section at PSF; main mass with Kuntz.

Data from:
  MB105
  Table 0
  Line 0:
Place of purchase:Rissani
Date:P 2014 Jan
Mass (g):63.5
Pieces:1
Class:EL3
Shock stage:S2
Weathering grade:low
Fayalite (mol%):0.2-1.0 (N = 18)
Ferrosilite (mol%):0.1-14.9 (N = 17)
Wollastonite (mol%):0.1-2.5
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):12.86
Type spec location:PSF
Main mass:F. Kuntz
Comments:K220; submitted by P. Sipiera
Plots: O isotopes:  
Institutions
   and collections
PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
Kuntz: Fabien Kuntz, France; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Mike Markowitz   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6968 approved meteorites from (Northwest Africa) (plus 2012 unapproved names)

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