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Northwest Africa 7035
Basic information Name: Northwest Africa 7035
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7035
Observed fall: No
Year found: 2012
Country: Morocco
Mass:help 816 g
Meteoritical Bulletin:  MB 100  (2012)  Eucrite-mmict
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 287 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 1 Apr 2012
Writeup from MB 100:

Northwest Africa 7035 (NWA 7035)

(Northwest Africa), Morocco

Found: Sept 2011

Classification: HED achondrite (Eucrite, monomict)

History: Found in September 2011 near Zagora, Morocco, and purchased from a Moroccan dealer at the Tucson Gem and Mineral Show in January 2012 by Greg Hupé.

Physical characteristics: A single, fresh, 816 g stone covered by black fusion crust (in places glossy with wrinkle ridges). The interior contains prominent yellowish-green pyroxene grains, dark-gray plagiolcase and black mesostasis regions containing vesicles.

Petrography: (A. Irving and S. Kuehner, UWS) Coarse ophitic igneous texture (grains to 2.5 mm). Groups of strongly zoned clinopyroxene grains with large laths of calcic plagioclase, large grains of silica, ilmenite, iron sulfide and interstitial regions of dark, fine-grained, vesicular mesostasis (containing devitrified glass and some tiny grains of Ni-free metal). Pyroxenes contain irregular regions of pigeonite and subcalcic augite, but no exsolution lamellae are present. Ferropigeonite occurs as rims on some large pyroxene grains and in the mesostasis. Fayalite also occurs as rims on pyroxene grains and is in places intergrown with hedenbergite and silica.

Geochemistry: Pigeonite (Fs39.9-41.1Wo8.2-10.0, Fe/Mn=25-29), subcalcic augite (Fs52.6Wo24.3, Fe/Mn=32), ferropigeonite (Fs80.6±0.0Wo14.1-14.2, Fe/Mn=30-31). Oxygen isotopes (R. Tanaka, OkaU): laser fluorination analyses on acid-washed subsamples gave, respectively δ17O = 1.867, 1.815; δ18O = 3.993, 3.887; Δ17O = -0.235, -0.232 per mil.

Classification: Achondrite (eucrite, monomict). This specimen is unusual among ophitic-textured eucrites in having relatively coarse grained, strongly zoned pyroxenes lacking obvious exsolution lamellae.

Specimens: 20.5 g of type material and one polished thin section are on deposit at UWS. The remaining material is held by GHupé.

Data from:
  Table 1
  Line 1585:
State/Prov/County:(Northwest Africa)
Place of purchase:Tucson
Date:Sept 2011
Mass (g):816
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):39.9-41.1; 52.6; 80.6
Wollastonite (mol%):8.2-10.0; 24.3; 14.1-14.2
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.5
Type spec location:UWS
Main mass:GHupé
Comments:Submitted by A. Irving
Plots: O isotopes:  
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
GHupé: Gregory M. Hupé, 9003 Placid Lakes Blvd., Lake Placid, FL 33852, United States; Website (private address)
OkaU: Institute for Study of the Earth's Interior, Okayama University, Misasa Tottori 682-0193, Japan (institutional address)
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
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     This is 1 of 2 approved meteorites from (Northwest Africa), Morocco
     This is 1 of 2093 approved meteorites from Morocco (plus 32 unapproved names) (plus 1 impact crater)

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