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Northwest Africa 7253
Basic information Name: Northwest Africa 7253
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7253
Observed fall: No
Year found: 2012
Country: Morocco
Mass:help 404 g
Meteoritical Bulletin:  MB 100  (2012)  Eucrite
Recommended:  Eucrite    [explanation]

This is 1 of 569 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 14 Apr 2012
Writeup from MB 100:

Northwest Africa 7253 (NWA 7253)


Purchased: 2012

Classification: HED achondrite (Eucrite)

History: Purchased by Blaine Reed in Tucson 2012.

Physical characteristics: Many small fragments, some with shiny black fusion crust, light desert coating on exterior. Broken surface shows fresh, fine-grained mix of plagioclase and pyroxene.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows ~55% pyroxene and ~40% plagioclase, with minor silica, chromite and ilmenite. Olivine is ubiquitous in grain boundaries. Some pyroxenes show zoning with Mg-rich cores, twinning absent.

Geochemistry: (C. Agee and M. Spilde, UNM) Unequilibrated basalt with a range of pyroxene compositions consistent with type-2 eucrites (Takeda and Graham, 1991). Low Ca-pyroxene Fs45.9±13.1Wo6.5±3.0, Fe/Mn=32±1, n=66, high-Ca pyroxene Fs37.4±7.6Wo31.0±8.7, Fe/Mn=32±1, N=23, plagioclase Or0.6±0.3Ab10.7±3.7An88.8±4.0, n=15, olivine Fa82.0±0.8, Fe/Mn=42±1, n=19.

Classification: Achondrite (Eucrite). Unequilibrated eucrite with pyroxene compositions similar to Pasamonte. Minimal weathering, some fine grained cataclastic brecciation.

Specimens: 24.2 g including a probe mount on deposit at UNM, Reed holds 190 g, Yinan Wang holds 180 g.

Data from:
  Table 1
  Line 1696:
Place of purchase:Tucson
Date:P 2012
Mass (g):404
Fayalite (mol%):82.0±0.8
Ferrosilite (mol%):45.9±13.1, 37.4±7.6
Wollastonite (mol%):6.5±3.0, 31.0±8.7
Classifier:C. Agee, UNM
Type spec mass (g):24.2
Type spec location:UNM
Main mass:Blaine Reed, Yinan Wang
Comments:Submitted by C. Agee
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
Reed: Blaine Reed, P.O. Box 1141, Delta, CO 81416, United States; Website (private address)
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
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     This is 1 of 1932 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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