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Northwest Africa 8563
Basic information Name: Northwest Africa 8563
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8563
Observed fall: No
Year found: 2014
Country: Mauritania
Mass:help 9.13 kg
Meteoritical Bulletin:  MB 103  (2014)  Eucrite-mmict
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 272 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 8 Oct 2014
Writeup from MB 103:

Northwest Africa 8563 (NWA 8563)


Purchased: August 2014

Classification: HED achondrite (Eucrite, monomict)

History: A 9125 g meteorite was purchased by Michael Farmer from a meteorite dealer in Tan Tan, Morocco. The stone is reportedly from Mauritania.

Physical characteristics: Rounded, shiny sand-blasted stone lacking fusion crust. Large (22 × 19 cm) sawn and polished slab shows a breccia of tan, angular to rounded clasts to 3 cm in a dark matrix. Vesicles to 5 mm are common within the dark veins.

Petrography: (L. Garvie, ASU) SEM examination of a polished mount shows a monomict, subophitic basaltic breccia of eucritic clasts separated by shock veins, some with cataclastic fine-grained regions. Clasts dominated by roughly equal proportions of low-Ca pyroxene (most grains with augite exsolution lamellae) and augite (most grains with low-Ca pyroxene exsolution lamellae), and calcic plagioclase; grain size to 600 μm. Silica locally abundant, with grains to 500 μm. Accessory low-Ni iron metal (to 50 μm), chromite with variable Ti content (to 20 μm), ilmenite (to 100 μm), and troilite (to 5 μm).

Geochemistry: (L. Garvie, ASU) Low-Ca pyroxene Fs60.9±1.2Wo2.6±0.9, FeO/MnO=31.4±0.8, n=11; augite Fs26.6±0.8Wo43.5±0.9, FeO/MnO=31.5±1.4, n=11; plagioclase An90.2±0.6Ab9.5±0.5, n=5; silica with 0.3±0.1 wt% Al2O3 and 0.2±0.1 wt% FeO.

Classification: Achondrite, monomict eucrite

Specimens: 388 g and one polished mount at ASU.

Data from:
  Table 0
  Line 0:
Place of purchase:Tan Tan, Morocco
Date:P August 2014
Mass (g):9125
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):60.9±1.2; 26.6±0.8
Wollastonite (mol%):2.6±0.9; 43.5±0.9
Classifier:L. Garvie, ASU
Type spec mass (g):388
Type spec location:ASU
Main mass:MFarmer
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)
MFarmer: Michael Farmer, P.O. Box 86059, Tucson, AZ 85754-6059, United States; Website (private address)
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 187 approved meteorites from Mauritania (plus 2 unapproved names) (plus 2 impact craters)

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