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Northwest Africa 8545
Basic information Name: Northwest Africa 8545
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8545
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 57.8 g
Meteoritical Bulletin:  MB 103  (2014)  Achondrite-ung
Recommended:  Achondrite-ung    [explanation]

This is 1 of 135 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 18 Oct 2014
Writeup from MB 103:

Northwest Africa 8545 (NWA 8545)

(Northwest Africa)

Purchased: 2013

Classification: Ungrouped achondrite

History: Purchased by Brahim Tahiri from a Moroccan hunter and sent to his partner Sean Tutorow for classification, April, 2013.

Physical characteristics: Single stone. Exterior shows remnants of black fusion crust, saw cut reveals light orange-brown crystalline texture with scattered dark grains ~1 mm, moderately friable.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows approximately 70% pyroxene and ~30% plagioclase. Pyroxenes all show exsolution lamellae, grains are 500-2000 μm, and have a striking appearance in that the grain boundaries are all very irregular with ~50 μm embayments and protrusions. Plagioclase is interstitial to pyroxene and poikioblastic with silica inclusions, some grains up to 1000 μm. Accessory troilite and Cr-Ti oxides.

Geochemistry: (C. Agee and N. Muttik, UNM) Pigeonite Fs62.4±1.9Wo7.6±2.1, Fe/Mn=69±2, n=9; augite Fs39.9±5.4Wo34.0±6.3, Fe/Mn=67±5, n=8; olivine Fa84.2, Fe/Mn=89, n=1; plagioclase An85.3±2.6Ab14.2±2.5Or0.4±0.1, n=10. Oxygen isotopes (K. Ziegler, UNM) Oxygen isotope values of 3 acid-washed aliquots of bulk sample, 1.3, 1.3, 2.1 mg, gave δ17O = 0.004, 0.120, 0.013, δ18O = 2.966, 3.159, 2.297, Δ17O = -1.562, -1.548, -1.532 (linearized, all permil).

Classification: Achondrite (ungrouped), probably paired with NWA 011 and NWA 2976.

Specimens: 11.7 g including a probe mount on deposit at UNM, Sean Tutorow holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2013
Mass (g):57.8
Weathering grade:low
Fayalite (mol%):84.2
Ferrosilite (mol%):62.4; 39.9
Wollastonite (mol%):7.6; 34.0
Classifier:C. Agee, UNM
Type spec mass (g):11.7
Type spec location:UNM
Main mass:Sean Tutorow
Comments:Field name G520; submitted by C. Agee, UNM
Plots: O isotopes:  
   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:
Find references in Google Scholar:

     This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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