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Northwest Africa 7484
Basic information Name: Northwest Africa 7484
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7484
Observed fall: No
Year found: 2012
Country: Morocco
Mass:help 428 g
Meteoritical Bulletin:  MB 101  (2012)  Howardite
Recommended:  Howardite    [explanation]

This is 1 of 427 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 8 Nov 2012
Writeup from MB 101:

Northwest Africa 7484 (NWA 7484)


Purchased: Aug 2012

Classification: HED achondrite (Howardite)

History: Purchased by Adam Bates from a meteorite dealer in Morocco, August, 2012.

Physical characteristics: Single stone, dark brown, lightly weathered, and fusion crusted. Saw cut reveals fresh, brecciated texture, numerous white and dark clasts up to 3mm, set in a medium-gray groundmass.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows a brecciated texture with a wide range of silicate grain sizes, 1-500 μm, with three distinct pyroxene populations: 40% diogenitic, 36% main group eucritic, and 24% cumulate eucritic; n=50. Some pyroxenes show zoning in backscatter electron images, while others display exsolution lamellae. Phase proportions: pyroxene ~70%, plagioclase ~20%, with accessory silica, ilmenite, troilite, and low-Ni iron metal.

Geochemistry: (C. Agee and M. Spilde, UNM) Diogenite low Ca-pyroxene Fs26.0±2.5Wo2.7±1.2, Fe/Mn=31±2, n=20; cumulate eucrite low-Ca pyroxene Fs43.4±4.0Wo4.3±2.9, Fe/Mn=33±3, n=11; cumulate eucrite augite Fs21.6Wo41.6, Fe/Mn=29; main group pyroxene Fs53.2±6.6Wo11.4±8.9, Fe/Mn=33±4, n=18; plagioclase Or0.4±0.1Ab9.2±2.4An90.3±2.5 n=4.

Classification: Achondrite (howardite)

Specimens: 21.09 g including a probe mount on deposit at UNM, Adam Bates holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P Aug 2012
Mass (g):428
Ferrosilite (mol%):26.0±2.5, 43.4±4.0, 53.2±6.6
Wollastonite (mol%):2.7±1.2, 4.3±2.9, 11.4±8.9
Classifier:C. Agee, UNM
Type spec mass (g):21.09
Type spec location:UNM
Main mass:Adam Bates
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)
References: Published in Meteoritical Bulletin, no. 101, MAPS 50, 1661, September 2015
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     This is 1 of 1904 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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