4.12g CR2 Carbonaceous Chondrite Meteorite Slice I NWA 7020
| Northwest Africa 7020 | |||||||||||||||||||||||||||||||
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| 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 |
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| Classification history: |
This is 1 of 182 approved meteorites classified as CR2. [show all] Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), and CR chondrites |
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| 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. |
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| Data from: MB102 Table 0 Line 0: |
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| Plots: | O isotopes: |
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| 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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