Meteorite NWA 7831 Diogenite HED Achondrite meteorite, 100 grams For Sale

NORTHWEST AFRICA 7831(NWA 7831)HEDDIOGENITE METEORITEDISCOVERED IN 3TH OF MARCH 2013IN SPECIMENS TOTALLING 100GRAMS GUARANTEED AUTHENTICITY
YOU ARE BUYING 100% A GUARANTEED AUTHENTIC METEORITEcombined with a signed certificate of authenticity

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THIS 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 HomePublicationsContactsNorthwest 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 Bulletin:MB 6 Sep 2014WriteupWriteup fromMB 103:

Northwest Africa 7831(NWA 7831)27.307°N,12.083°W

Saguia el Hamra, Western Sahara

Found: 2013 Mar

Classification: 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 atUWB. The remainder is held by several anonymous collectors.

Data from:
MB103
Table 0
Line 0:State/Prov/County:Saguia el HamraDate:2013 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: