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Item: 155534766319
Condition:New: A brand-new, unused, unopened, undamaged item (including handmade items). See the seller’s … Read moreabout the conditionNew: A brand-new, unused, unopened, undamaged item (including handmade items). See the seller’s listing for full details. See all condition definitionsopens in a new window or tab
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New fall:Fresh crust
eBay 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) Track Page Views With Auctiva’s Counter
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