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Northwest Africa 8615
Basic information Name: Northwest Africa 8615
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8615
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 109 g
Meteoritical Bulletin:  MB 103  (2014)  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 10 Nov 2014
Writeup from MB 103:

Northwest Africa 8615 (NWA 8615)

(Northwest Africa)

Purchased: April 1, 2014

Classification: HED achondrite (Howardite)

History: Purchased by Steve Witt from a dealer in Morocco on April 1, 2014.

Physical characteristics: Two matching stones, weathered exterior with some caliche. A saw-cut reveals a breccia of light and dark clasts set in dark brown matrix.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows a highly brecciated texture with ~50% diogenitic pyroxenes, ~25% gabbroic eucrite pyroxenes showing Fe zoning, and ~25% equilibrated basaltic eucrite clasts showing clear separation between augite and pigeonite, with coarse exsolution lamellae. Accessory Fe-Ni metal, troilite, Ti-rich chromite, chromite, and ilmenite throughout.

Geochemistry: (C. Agee and N. Muttik, UNM) Diogenite orthopyroxene Fs28.8±6.2Wo2.4±1.4, Fe/Mn=34±6, n=10; gabbroic eucrite low-Ca pyroxene Fs47.1±3.7Wo4.7±3.7, Fe/Mn=36±6, n=8, basaltic eucrite augite Fs44.3±11.0Wo27.0±12.6, Fe/Mn=34±1, n=3; basaltic eucrite pigeonite Fs62.9±1.2Wo6.6±1.9, Fe/Mn=33±2, n=3; plagioclase An89.3±2.5Ab10.2±2.3Or0.5±0.2, n=6.

Classification: Achondrite (howardite) with three lithologies: 1) diogenite, 2) unequilibrated gabbroic eucrite with zoned pyroxenes, 3) equilibrated basaltic eucrite.

Specimens: 22.0 g including a probe mount on deposit at UNM, Steve Witt holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P April 1, 2014
Mass (g):109
Shock stage:high
Weathering grade:moderate
Ferrosilite (mol%):28.8±6.2, 47.1±3.7, 62.9±1.2
Wollastonite (mol%):2.4±1.4, 4.7±3.7, 6.6±1.9
Classifier:C. Agee, UNM
Type spec mass (g):22.0
Type spec location:UNM
Main mass:Steve Witt
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. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
Find references in NASA ADS:
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     This is 1 of 8777 approved meteorites from (Northwest Africa) (plus 1879 unapproved names)

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