Description: NORTHWEST AFRICA 7831 (NWA 7831) HED DIOGENITE METEORITE DISCOVERED IN 3TH OF MARCH 2013IN CHOUICHIYATCOORDINATES:27.307°N,12.083°WMOROCCO8 SPECIMENS TOTALLING 117 GRAMS GUARANTEED AUTHENTICITY YOU ARE BUYING 100% A GUARANTEED AUTHENTIC METEORITE combined with a signed certificate of authenticityFirst express class delivery and provenance provided. I SHIP WORLDWIDE WITH FEDEX, DHL, UPS OR SIMILAR EXPRESS SERVICE, TRACKED & TRACEDThis Items will not include any reference and will be posted as a "Gift" for Customs purposesTHIS METEORITE HAS GEM LIKE OLIVINE TRANSLUCENT PYROXENE CRYSTALS. OFFICIAL CLASSIFICATION DATA SOURCE: THE METEORITICAL SOCIETY INTERNATIONAL SOCIETY FOR METEORITICS AND PLANETARY SCIENCE LUNAR AND PLANETARY INSTITUTE METEORITICAL BULLETIN DATABASE MetSoc Home Publications Contacts Northwest Africa 7831Basic informationName: Northwest Africa 7831 This is an OFFICIAL meteorite name. Abbreviation: NWA 7831 Observed fall: No Year found: 2013 Country: Western Sahara Mass: 20 kg Classification history:Meteoritical Bulletin: MB 103 (2014) DiogeniteRecommended: Diogenite Comments:Approved 6 Sep 2014WriteupWriteup from MB 103: Northwest Africa 7831 (NWA 7831) 27.307°N, 12.083°WSaguia el Hamra, Western SaharaFound: 2013 MarClassification: HED achondrite (Diogenite)History: Found buried in the ground near Chouichiyat on March 3, 2013, and excavated by a team of local people.Physical characteristics: A single large mass (at least 20 kg) composed of yellow-green crystalline material with pale orange weathering products along numerous fractures. Much of the material disintegrated into fragments upon excavation.Petrography: (A. Irving and S. Kuehner, UWS) The specimen is composed almost entirely of translucent, yellow-green orthopyroxene with very sparse, tiny included grains of Ni-free metal, troilite, chromite, anorthite, silica polymorph and clinopyroxene. Secondary pale orange, clay-like deposits from terrestrial weathering are present along thin fractures.Geochemistry: Orthopyroxene (Fs28.1-28.3Wo3.0-3.3; FeO/MnO = 29-31), clinopyroxene (Fs10.9Wo43.1, FeO/MnO = 26). Oxygen isotopes (K. Ziegler, UNM): analyses of acid-washed orthopyroxene by laser fluorination gave, respectively, δ17O = 1.677, 1.793, 1.810; δ18O = 3.680, 3.879, 3.875; Δ17O = -0.266, -0.255, -0.236 per mil.Specimens: 44.5 g of material is on deposit at UWB. The remainder is held by several anonymous collectors.Data from: MB103 Table 0 Line 0:State/Prov/County:Saguia el HamraDate:2013 MarLatitude:27.307°NLongitude:12.083°WMass (g):>20000Pieces:1Class:DiogeniteShock stage:lowWeathering grade:moderateFerrosilite (mol%):see textClassifier:A. Irving and S. Kuehner, UWSType spec mass (g):45.4Type spec location:UWBMain mass:AnonymousComments:Submitted by A. IrvingPlots:O isotopes:
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End Time: 2025-01-11T16:02:01.000Z
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