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Northwest Africa 8535
Basic information Name: Northwest Africa 8535
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8535
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 149 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  Angrite
Recommended:  Angrite    [explanation]

This is 1 of 32 approved meteorites classified as Angrite.   [show all]
Search for other: Achondrites, Angrites
Comments: Approved 16 Sep 2014
Writeuphelp
Writeup from MB 103:

Northwest Africa 8535 (NWA 8535)

(Northwest Africa)

Purchased: 2014 Mar 6

Classification: Angrite

History: Purchased by Habib Naji in Guelmin, Morocco, 6 March 2014, from a nomad who reportedly found the meteorite at Tazounte, ~100 km east of Guelmim.

Physical characteristics: Single stone. Exterior with patches of black fusion crust, coarse green crystals up to several mm, scattered mm-sized vugs, broken surface reveals bright green crystalline texture with some dark grains, fresh.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows approximately 90% olivine and ~5% fassaite. Olivines are zoned with Fe-enriched rims, olivine rims are also Ca-enriched, average grain size ~700 μm, triple junctions commonly occupied with fassaite. Accessory aluminous-spinel, chromite, troilite, kamacite, and taenite.

Geochemistry: (C. Agee and N. Muttik, UNM) Olivine Fa19.4±5.8, Fe/Mn=88±2, CaO=0.39±0.41 (wt%), Cr2O3=0.23±0.13 (wt%), n=24; fassaite Fs11.1±0.8Wo56.0±1.7, Fe/Mn=86±19, Al2O3=13.85±2.71 (wt%), TiO2=1.9±0.4 (wt%), n=12. Oxygen isotopes (K. Ziegler, UNM): acid-washed material analyzed in 3 replicates by laser fluorination gave, respectively δ18O = 2.589, 3.925, 3.761; δ17O = 1.297, 1.934, 1.877; Δ17O = -0.070, -0.138, -0.109 (linearized, all per mil).

Classification: Dunitic angrite, with possibly the most magnesian olivines of any known angrite. Δ17O oxygen isotope values are within the typical angrite range, however one analysis had anomalously low δ17O and δ18O.

Specimens: 20.5 g including a probe mount on deposit at UNM, H. Naji holds the main mass.

Data from:
  MB103
  Table 0
  Line 0:
Place of purchase:Guelmin, Morocco
Date:P 2014 Mar 6
Mass (g):149
Pieces:1
Class:Angrite
Weathering grade:low
Fayalite (mol%):19.4±5.8
Ferrosilite (mol%):11.1±0.8
Wollastonite (mol%):56.0±1.7
Classifier:C. Agee, UNM
Type spec mass (g):20.5
Type spec location:UNM
Main mass:Habib Naji
Comments:Submitted by C. Agee
Plots: O isotopes:  
Institutions
   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)
Catalogs:
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:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6877 approved meteorites from (Northwest Africa) (plus 2037 unapproved names)

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