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Northwest Africa 6875 | |||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 6875 This is an OFFICIAL meteorite name. Abbreviation: NWA 6875 Observed fall: No Year found: 2011 Country: Morocco Mass: 300 g | ||||||||||||||||||||||||||
Classification history: |
This is 1 of 93 approved meteorites classified as Lodranite. [show all] Search for other: Acapulcoite-lodranite family, Lodranites, and Primitive achondrites | ||||||||||||||||||||||||||
Comments: | Approved 1 Aug 2011 | ||||||||||||||||||||||||||
Writeup |
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: |
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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) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
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Geography: |
Statistics: This is 1 of 2068 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||
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Revision history: |
This lists important revisions made to data for this record.
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