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4.12g CR2 Carbonaceous Chondrite Meteorite Slice I NWA 7020 - TOP METEORITE

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Seller: top_meteorite ✉️ (690) 100%, Location: Loveland, Colorado, US, Ships to: AMERICAS & many other countries, Item: 155534766319 4.12g CR2 Carbonaceous Chondrite Meteorite Slice I NWA 7020 - TOP METEORITE.

 

On Offer: 4.12g slice of CR2 | NWA 7020 Type: CR2 Carbonaceous Chondrite Origin:  Northwest Africa Official name: NWA 7020 Description: 4.12 gram slice of CR2 carbonaceous chondrite NWA 7020 What you get: 4.12 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. SEE OFFICIAL METEORITICAL BULLETIN DATABASE ENTRY BELLOW
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:  715 g
Classification   history:
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 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:   MB102   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:  
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) 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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  • Condition: New
  • Country/Region of Manufacture: Unknown
  • New fall: Fresh crust

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