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Northwest Africa 8730
Basic information Name: Northwest Africa 8730
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8730
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 51.8 g
Meteoritical Bulletin:  MB 104  (2015)  Eucrite-cm
Recommended:  Eucrite-cm    [explanation]

This is 1 of 54 approved meteorites classified as Eucrite-cm.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 4 Feb 2015
Writeup from MB 104:

Northwest Africa 8730 (NWA 8730)

(Northwest Africa)

Found: 2014

Classification: HED achondrite (Eucrite, cumulate)

History: Recovered in April 2014 near the borders of Mauritania, Western Sahara and Algeria. Purchased in Mauritania in June 2014.

Physical characteristics: A single stone with fusion crusted exterior. A saw cut reveals cumulate texture of mm-size white feldspar and green pyroxene grains.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows approximately equal amounts of pyroxene and plagioclase, unbrecciated, numerous shock fractures. Glassy fusion crust up to 30 μm thick. Accessory chromite.

Geochemistry: (C. Agee and N. Muttik, UNM). Low-Ca pyroxene Fs49.7±1.8Wo2.7±2.2, Fe/Mn=29±0, n=10; augite Fs19.9±0.7Wo44.0±1.4, Fe/Mn=25±1, n=11; plagioclase An93.4±0.4Ab6.2±0.4Or0.4±0.1, n=5; fusion crust (proxy for bulk composition) SiO2=46.9±1.1, TiO2=0.01±0.01, Al2O3=15.4±3.0, Cr2O3=0.25±0.06, MgO=9.5±1.5, FeO=15.5±2.5, MnO=0.57±0.08, NiO=0.02±0.04, CaO=10.4±0.9, Na2O=0.25±0.04, K2O=0.04±0.01 (all wt%), Mg#=52.1±1.1.

Classification: Achondrite (cumulate eucrite). Equilibrated, clear separation of high-Ca and low-Ca pyroxene. Low weathering grade, high shock stage.

Specimens: 10.5 g including a probe mount on deposit at UNM, DPitt holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Mass (g):51.8
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):49.7±1.8
Wollastonite (mol%):2.7±2.2
Classifier:C. Agee, UNM
Type spec mass (g):10.5
Type spec location:UNM
Main mass:Darryl Pitt
Comments:Field name MAC 83; submitted by C. Agee, UNM
   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)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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     This is 1 of 8890 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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