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Northwest Africa 8287
Basic information Name: Northwest Africa 8287
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8287
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 221 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  Acapulcoite
Recommended:  Acapulcoite    [explanation]

This is 1 of 80 approved meteorites classified as Acapulcoite.   [show all]
Search for other: Acapulcoite-lodranite family, Acapulcoites, and Primitive achondrites
Comments: Approved 14 Mar 2014
Writeuphelp
Writeup from MB 103:

Northwest Africa 8287 (NWA 8287)

(Northwest Africa)

Purchased: 2013

Classification: Primitive achondrite (Acapulcoite)

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

Physical characteristics: Single stone, weathered exterior with dark brown patina. Saw cut reveals abundant metal and sulfide set in a fine-grained silicate groundmass.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount. Silicates: ~95% orthopyroxene, ~3% plagioclase, ~2% diopside. Silicate grains 50-200 μm, polygonal texture with 120° triple-junction grain boundaries. Numerous kamacite and troilite domains up to 1000 μm which constitute ~25% of this meteorite. Metal/sulfide veinlets throughout, many on grain boundaries.

Geochemistry: (C. Agee and H. Miley, UNM) Orthopyroxene Fs10.6±0.1Wo1.7±0.3, Fe/Mn=14±1, n=7; diopside Fs4.9±0.1Wo44.0±0.3, Fe/Mn=10±1, Cr2O3=1.06±0.02 wt%, n=6; plagioclase Ab73.5±0.7An23.6±0.6Or2.9±0.2, n=8; kamacite Ni=10.8 wt%. Oxygen isotopes (K. Ziegler, UNM) Oxygen isotope values of 4 acid-washed aliquots of bulk sample, 1.5, 1.2, 1.5, 1.0 mg, gave δ17O = 0.121, 0.236, 0.356, 0.500, δ18O = 2.330, 2.585, 2.944, 3.200, Δ17O = -1.109, -1.129, -1.198, -1.190 (linearized, all permil).

Classification: Primitive achondrite (Acapulcoite) based on oxygen isotopes which are coincident with the acapulcoite/lodranite field, distinguished from lodranite type by the modal abundance of plagioclase and the relatively small silicate grain size. This acapulcoite is a highly equilibrated orthopyroxenite and is unique in that olivine is absent.

Specimens: 20.03 g including a probe mount on deposit at UNM, Sean Tutorow holds the main mass.

Data from:
  MB103
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2013
Mass (g):220.9
Pieces:1
Class:Acapulcoite
Classifier:C. Agee, UNM
Type spec mass (g):20.03
Type spec location:UNM
Main mass:Sean Tutorow
Comments:Field name G427; submitted by C. Agee, UNM
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:
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Franco Vignato   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7483 approved meteorites from (Northwest Africa) (plus 1994 unapproved names)

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