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Northwest Africa 7281
Basic information Name: Northwest Africa 7281
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7281
Observed fall: No
Year found: 2012
Country: Morocco
Mass:help 20 g
Classification
  history:
Meteoritical Bulletin:  MB 101  (2012)  Eucrite
Recommended:  Eucrite    [explanation]

This is 1 of 459 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 17 Jul 2012
Writeuphelp
Writeup from MB 101:

Northwest Africa 7281 (NWA 7281)

Morocco

Purchased: 2012 Jan 12

Classification: HED achondrite (Eucrite)

History: Purchased by Sean Tutorow in Morocco, January 12, 2012.

Physical characteristics: Single stone, no fusion crust, saw cut reveals breccia with numerous light-colored clasts or phenocrysts up to 5 mm, set in a light-gray groundmass.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows approximately 60% pyroxene, 30% plagioclase, ubiquitous silica, ilmenite, and troilite. Many pyroxenes show exsolution lamellae. Silicate shock melt veins and pockets throughout, some cataclastic zones present.

Geochemistry: (C. Agee and N. Wilson, UNM) EMPA. Low Ca-pyroxene Fs60.7±0.9Wo3.0±1.0, Fe/Mn=32±1 (at.%) n=4; pigeonite Fs50.9±0.6Wo15.3±0.8, Fe/Mn=30±2, n=2; augite Fs27.3±1.0Wo43.1±0.9, Fe/Mn=31±1, n=6; plagioclase Or0.5±0.1Ab9.9±0.3An89.6±0.4, n=4. Silicate melt SiO2=49.41±0.73, Al2O3=18.03±1.32, TiO2=0.74±0.19, CaO/Al2O3=0.68±0.03 FeO/MnO=34±2 (wt%) n=8.

Classification: Equilibrated, brecciated eucrite. Minor weathering.

Specimens: 4.5 g including a probe mount on deposit at UNM, Sean Tutorow holds the main mass.

Data from:
  MB101
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2012 Jan 12
Mass (g):20.04
Pieces:1
Class:Eucrite
Ferrosilite (mol%):60.7±0.9, 50.9±0.6, 27.3±1.0
Wollastonite (mol%):3.0±1.0 15.3±0.8 43.1±0.9
Classifier:C. Agee, UNM
Type spec mass (g):4.5
Type spec location:UNM
Main mass:Sean Tutorow
Comments:Submitted by C. Agee
Institutions
   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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 101, MAPS 50, 1661, September 2015
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1466 approved meteorites from Morocco (plus 21 unapproved names) (plus 1 impact crater)

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