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Northwest Africa 11112
Basic information Name: Northwest Africa 11112
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11112
Observed fall: No
Year found: 2016
Country: Morocco
Mass:help 528 g
Classification
  history:
Recommended:  Achondrite-ung    [explanation]

This is 1 of 81 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 9 Apr 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 11112 (NWA 11112)

Morocco

Find: 2016

Classification: Ungrouped achondrite

History: Purchased by Ke Zuokai in Dec. 2016 from a Moroccan dealer.

Physical characteristics: The meteorite has a black fusion crust and partially covered by weathering products.

Petrography: A polished mount shows a medium-grained rock (mostly 0.1-1 mm) with granular texture. It is composed of ~47% olivine and ~42% pyroxene with intersertally ~4% plagioclase and 7% opaque minerals (FeNi metal, sulfide and chromite). No relic chondrules. Not brecciated.

Geochemistry: The compositions of olivine, pyroxene and plagioclase are quite uniform. Olivine Fa36.4-38.5, Fe/Mn=80.2-108.1; orthopyroxene Fs29.1-30.0Wo2.8-3.2, Fe/Mn=51.2-63.6; plagioclase An52.3-55.7Ab43.0-46.5Or1.1-1.3; chromite TiO2 1.51-1.80, Al2O3 13.71-14.05, MgO 3.01-3.72 (all in wt%); taenite Ni 16.09-21.16 wt%; kamacite Ni 6.58-6.93 wt%.

Classification: Achondrite (ungrouped). No relic chondrules are found in this thin section, and the compositions of plagioclase (~An52.3) are significantly different from those of chondrites. In this regard, we consider NWA 11112 is not an equilibrated chondrite. The petrography and mineral compositions (olivine, pyroxene, plagioclase, chromite and Fe-Ni metal) in this meteorite are very similar to those of the ungrouped achondrite NWA 3250.

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Beijing
Date:2016
Mass (g):528
Pieces:2
Class:Achondrite-ung
Shock stage:low
Weathering grade:weak
Fayalite (mol%):37.3±0.6 (n=16)
Ferrosilite (mol%):29.3±0.2 (n=13)
Wollastonite (mol%):3.1±0.1 (n=13)
Classifier:Li Y., PMO
Type spec mass (g):20
Type spec location:PMO
Main mass:Ke Zuokai
Comments:Submitted by Hsu W.
Institutions
   and collections
PMO: Purple Mountain Observatory, Nanjing, China (institutional address; updated 16 Dec 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, in preparation (2018)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1304 approved meteorites from Morocco (plus 12 unapproved names) (plus 1 impact crater)

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