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Northwest Africa 8383
Basic information Name: Northwest Africa 8383
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8383
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 24.9 g
Meteoritical Bulletin:  MB 103  (2014)  Eucrite-cm
Recommended:  Eucrite-cm    [explanation]

This is 1 of 55 approved meteorites classified as Eucrite-cm.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 21 May 2014
Writeup from MB 103:

Northwest Africa 8383 (NWA 8383)

(Northwest Africa)

Purchased: 2013

Classification: HED achondrite (Eucrite, cumulate)

History: Single stone acquired by Ruben Garcia at the 2013 Denver mineral show and donated to CMS.

Physical characteristics: Single, 24.9 g, glossy fusion-crusted stone. Minor weathering. Sawn surface shows coarsely crystalline interior dominated by mm-sized light greenish-gray pyroxene crystals (roughly 85%), interstitial glassy to white plagioclase (roughly 15%), with a smattering of fine opaques.

Petrography: Thin section and microprobe examination shows coarse-grained cumulate basalt composed of intercumulus irregularly-shaped plagioclase (to 5 mm in the long dimension), with cumulate pyroxene (<3 mm). Most pyroxenes show fine (<1 μm) exsolution lamellae. Silicates highly fractured and show undulatory extinction and mosaicism. Chromite with two size ranges: scattered and sparse 100 to 500 μm, and ubiquitous fine grained, typically 10 μm. Rare troilite and Fe-metal to 20 μm. Some melt veins and fractures with small-scale brecciation are present, and range in width from a few tens of microns to ~100 microns across.

Geochemistry: (K. Tucker, J. Lagerman, A. Pena and L. Garvie, ASU) Low Ca-pyroxene Fs35.3±0.5Wo3.1±1.0, Fe/Mn=32.4, n=8; augite-diopside Fs14.0±0.7Wo45.0±0.4, Fe/Mn=26.6±2.0, n=5; and plagioclase An89.6±1.6Or0.4±0.1, n=5.

Classification: Achondrite (cumulate eucrite).

Specimens: 20.28 g and one polished thin section at ASU.

Data from:
  Table 0
  Line 0:
Place of purchase:Denver
Date:P 2013
Mass (g):24.9
Shock stage:medium
Weathering grade:low
Ferrosilite (mol%):35.3±0.5
Wollastonite (mol%):3.1±1.0
Classifier:K. Tucker, J. Lagerman, A. Pena and L. Garvie, ASU
Type spec mass (g):20.28
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 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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