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Northwest Africa 7020
Basic information Name: Northwest Africa 7020
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7020
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 715 g
Meteoritical Bulletin:  MB 102  (2013)  CR2
Recommended:  CR2    [explanation]

This is 1 of 188 approved meteorites classified as CR2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), and CR chondrites
Comments: Approved 22 Oct 2013
Writeup from MB 102:

Northwest Africa 7020 (NWA 7020)

(Northwest Africa)

Purchased: 2011 Feb

Classification: Carbonaceous chondrite (CR2)

History: Purchased by Blaine Reed from a Moroccan dealer at the Tucson Gem and Mineral Show in February 2011.

Petrography: (A. Irving and S. Kuehner, UWS) Fairly closely-packed, medium-sized (typically 0.4 to 0.7 mm) chondrules and rare fine-grained CAI in a red to brown stained matrix containing kamacite, pentlandite and possible cronstedtite-tochilinite (based on EMPA spectra). Some chondrules are partially rimmed by kamacite. CAI contain spinel partially rimmed by gehlenite and rare Al-diopside.

Geochemistry: Olivine (Fa1.8-58.1, n=8, Cr2O3 in ferroan olivine 0.34-0.42 wt.%, n=6), orthopyroxene (Fs1.3-1.5Wo0.7-0.9), subcalcic augite (Fs4.6Wo28.5), augite (Fs1.6-3.3Wo44.1-39.2). Oxygen isotopes (R. Tanaka, OkaU): analyses of acid-washed subsamples by laser fluorination gave δ17O -2.101, -3.022; δ18O 1.026, -0.014; Δ17O -2.643, -3.019.

Classification: Carbonaceous chondrite (CR2).

Specimens: The main mass is held by Reed. A total of 22.8 g of material and one polished thin section are on deposit at PSF.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2011 Feb
Mass (g):715
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):1.8-58.1 (n=8)
Ferrosilite (mol%):1.3-1.5
Wollastonite (mol%):0.7-0.9
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):22.8
Type spec location:PSF
Main mass:B. Reed
Comments:TN; submitted by P. Sipiera
Plots: O isotopes:  
   and collections
PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
OkaU: Institute for Study of the Earth's Interior, Okayama University, Misasa Tottori 682-0193, Japan (institutional address)
Reed: Blaine Reed, P.O. Box 1141, Delta, CO 81416, United States; Website (private address)
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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chen wang   

     This is 1 of 9570 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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