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Northwest Africa 7918
Basic information Name: Northwest Africa 7918
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7918
Observed fall: No
Year found: 2012
Country: Morocco
Mass:help 102.2 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  R3
Recommended:  R3    [explanation]

This is 1 of 34 approved meteorites classified as R3.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 3)
Comments: Approved 27 Jul 2013
Writeuphelp
Writeup from MB 102:

Northwest Africa 7918 (NWA 7918)

Morocco

Purchased: 2012

Classification: Rumuruti chondrite (R3)

History: Purchased by Brahim Tahiri from a Moroccan hunter and sent to his partner Sean Tutorow for classification, 2012.

Physical characteristics: Single stone, dark brown fusion crust, with polygonal cracks, saw-cut reveals numerous chondrules of various sizes, some up to 2 mm, set in an orange-brown groundmass, tiny scattered reflective opaques.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows numerous chondrules, some irregularly shaped, some with abundant plagioclase, breccia clasts also present. Fe-oxide, Ni-rich sulfide, troilite, and a single Ti-bearing sulfide detected.

Geochemistry: (C. Agee and L. Burkemper, UNM) Olivine Fa38.7±2.2, Fe/Mn=81±5, NiO=0.06±0.03 wt%, n=27; low-Ca pyroxene Fs26.1±6.1Wo1.1±0.9, Fe/Mn=61±22, n=13; high-Ca pyroxene Fs12.8±3.6Wo39.6±8.2, Fe/Mn=43±10, n=2; plagioclase Ab87±1, n=2.

Classification: Rumuruti chondrite (R3.9), petrologic type based on the coefficient of variation (CV=6%) of chondrule olivine mean fayalite content.

Specimens: 20 g including a probe mount on deposit at UNM, Sean Tutorow holds the main mass.

Data from:
  MB102
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2012
Mass (g):102.19
Pieces:1
Class:R3
Fayalite (mol%):38.7±2.2
Ferrosilite (mol%):26.1±6.1
Wollastonite (mol%):1.1±0.9
Classifier:C. Agee, UNM
Type spec mass (g):20
Type spec location:UNM
Main mass:Sean Tutorow
Comments:Field name G-368; submitted by C. Agee
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. 102, MAPS 50, 1662, September 2015
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Noel Darlucio Pura      
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1407 approved meteorites from Morocco (plus 16 unapproved names) (plus 1 impact crater)

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