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2.79g CR2 Carbonaceous Chondrite Meteorite Slice I NWA 7020

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  • $ 115.00

On Offer: 2.79g slice of CR2 I NWA 7020
Type: CR2 Carbonaceous Chondrite
Origin: Northwest Africa
Official name: NWA 7020
Description: 2.79 gram slice of CR2 carbonaceous chondrite NWA 7020
What you get: 2.79 gram CR2 NWA 7020 Meteorite specimen as shown, membrane storage/display box, & signed Certificate of Authenticity.
I offer a 100% no questions asked 30 day return policy.

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:      (2013)   CR2
Recommended:   CR2    [explanation]

This is 1 of 182 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
Pieces: many
Class: CR2
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)

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