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Northwest Africa 6875
Basic information Name: Northwest Africa 6875
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6875
Observed fall: No
Year found: 2011
Country: Morocco
Mass:help 300 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  Lodranite
Recommended:  Lodranite    [explanation]

This is 1 of 81 approved meteorites classified as Lodranite.   [show all]
Search for other: Acapulcoite-lodranite family, Lodranites, and Primitive achondrites
Comments: Approved 1 Aug 2011
Writeuphelp
Writeup from MB 100:

Northwest Africa 6875 (NWA 6875)

Morocco

Found: 2011

Classification: Primitive achondrite (Lodranite)

History: Purchased by Jay Piatek in 2011.

Physical characteristics: Single 300 g stone, with rough, weathered exterior. Broken surface reveals granular texture, some oxide staining.

Petrography: (C. Agee, UNM) SEM, EDS, EMPA. Microprobe examination of a polished epoxy mount shows olivine 30%, orthopyroxene 50%, diopsidic pyroxene 15%, ubiquitous phosphate, chromite, sulfide blebs as inclusions and decorating silicate grain boundaries, and Fe-metal (oxidized) as films in grain boundaries and crosscutting veinlets. Olivine grain size 50-600 μm, orthopyroxene grain size 100-800 μm. Polygonal texture with numerous 120° triple junctions.

Geochemistry: (C. Agee, UNM) EMPA. Olivine Fa14.0±0.4, Fe/Mn=26±2, N=12, orthopyroxene Fs16.2±0.1Wo2.7, Fe/Mn=21±1, N=11, diopsidic pyroxene Fs7.3±0.2Wo43.7±0.6, Fe/Mn=15±2, Cr2O3=1.13±0.08 wt%, N=10, two phosphate phases: chlorapatite Cl=6.0 wt% and merrillite, chromite Cr#=81±2 Mg#=26±4, N=7. Two sulfide phases: troilite and rare pentlandite. No plagioclase found.

Classification: Achondrite (lodranite), distinguished from acapulcoite classification by absence of plagioclase, grain size is at the low end for lodranites. Weathering grade W2, low shock grade.

Specimens: 20 g and probe mount on deposit at UNM. Piatek holds the main mass,

Data from:
  MB100
  Table 1
  Line 1524:
Place of purchase:Morocco
Date:2011
Mass (g):300
Pieces:1
Class:Lodranite
Fayalite (mol%):14.0±0.4
Ferrosilite (mol%):16.2±0.1; 7.3±0.2
Wollastonite (mol%):2.7; 43.7±0.6
Classifier:C. Agee, UNM
Type spec mass (g):20
Type spec location:UNM
Main mass:Piatek
Comments: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. 100, MAPS 49, E1-E101 (2014)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1488 approved meteorites from Morocco (plus 22 unapproved names) (plus 1 impact crater)

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