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Northwest Africa 8486
Basic information Name: Northwest Africa 8486
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8486
Observed fall: No
Year found: 2014
Country: Morocco
Mass:help 43.8 g
Meteoritical Bulletin:  MB 103  (2014)  Achondrite-ung
Recommended:  Achondrite-ung    [explanation]

This is 1 of 119 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 26 Jul 2014
Writeup from MB 103:

Northwest Africa 8486 (NWA 8486)


Purchased: 2014 June

Classification: Ungrouped achondrite

History: Purportedly found at the same site as NWA 7325 near Bir el Abbas, Morocco. Acquired by CMS from Ruben Garcia in June, 2014.

Physical characteristics: A single, dark greenish stone (43.81 g), with one side showing chartreuse-colored fusion crust. Cut surfaces show almost equal amounts of bright, transparent, apple-green clinopyroxene (crystals to 3 mm) and milky white plagioclase (regions to 5 mm). The plagioclase contains abundant "clouds" of opaques heterogeneously distributed and concentrated. Vugs (to 2 mm) common within the plagioclase and at the plagioclase/clinopyroxene boundaries. Olivine, which is clear and glassy, is uncommon, occurring as grains to 1.5 mm and constituting <5 areal% of four examined surfaces.

Petrography: (L. Garvie, ASU) One polished mount (of 4 cm2) dominated by an apparent cumulate texture of diopside (Al and Cr-bearing) and calcic plagioclase. Pyroxene shows several sets of twin lamellae. Pyroxene/plagioclase grain boundaries show a micro-euhedral consertal texture of interdigitating euhedral plagioclase (to 10 μm) penetrating the pyroxene, and small "relict" micronmeter-sized grains of pyroxene in the plagioclase adjacent to the boundary. Olivine/plagioclase and olivine/pyroxene boundaries are sharp and smooth. Olivine show rounded and lobate-shaped grains. "Clouds" of micrometer-sized opaques (Cr-troilite and kamacite) locally common in the plagioclase. Accessory Cr-troilite, kamacite, and taenite, together with possibly weathered P-K-Si phases associated with the opaques.

Geochemistry: (L. Garvie, ASU) Clinopyroxene, Fs1.15±0.03Wo45.06±0.12, Al2O3=2.72±0.12 wt%, Cr2O3=0.98±0.02 wt%, n=11. Plagioclase, An88.78±1.06Or0.0, n=10. Olivine Fa2.93±0.12, Cr2O3=0.37±0.01 wt%, CaO=0.34±0.01 wt%, FeO/MnO=39.3±9.1, n=10.

Classification: Ungrouped achondrite paired with NWA 7325 and NWA 8014.

Specimens: 43.81 g at CMS.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2014 June
Mass (g):43.81
Weathering grade:low
Fayalite (mol%):2.93
Ferrosilite (mol%):1.2
Wollastonite (mol%):45.1
Classifier:L. Garvie, ASU
Type spec mass (g):43.81
Type spec location:ASU
Main mass:ASU
Comments:Submitted by L. Garvie
   and collections
ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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     This is 1 of 1894 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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