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Northwest Africa 14176
Basic information Name: Northwest Africa 14176
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14176
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 310 g
Classification
  history:
Recommended:  Eucrite-an    [explanation]

This is 1 of 13 approved meteorites classified as Eucrite-an.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 6 Oct 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 14176 (NWA 14176)

(Northwest Africa)

Purchased: 2020 Sep

Classification: HED achondrite (Eucrite, anomalous)

History: Purchased by Luc Labenne in September 2020 from a Moroccan dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Porphyritic texture. Relatively large (up to 1 cm long), subhedral prismatic macrocrysts of exsolved pigeonite (pale orange-tan in thin section) are set in a finer grained groundmass composed of parallel-intergrown pigeonite and calcic plagioclase together with accessory silica polymorph, Ti-chromite, ilmenite, merrillite, troilite and baddeleyite. The macrocrysts consist of host low-Ca pyroxene with augite exsolution lamellae, but they also contain abundant thin (1-2 μm) exsolution lamellae of chromite and arrays of blebby plagioclase distributed along both rational and irrational crystallographic planes.

Geochemistry: Macrocryst low-Ca pyroxene host (Fs47.0-51.0Wo1.5-1.9, FeO/MnO = 32-33, N = 3), augite exsolution lamellae (Fs20.3-22.7Wo43.1-44.2, FeO/MnO = 27-29, N = 3), groundmass low-Ca pyroxene (Fs51.0-54.4Wo1.5-3.4, FeO/MnO = 30-31, N = 2), plagioclase (An82.5-83.0Or1.0-1.8, N = 3).

Classification: Eucrite (unbrecciated, pyroxene-phyric, anomalous). This material is identical to and paired with NWA 13355. The porphyritic igneous texture, prominent chromite and plagioclase exsolution in pyroxenes, and atypical oxygen isotopic composition (for NWA 13355) are anomalous features.

Specimens: 20.4 g including one polished thin section at UWB; remainder with Labenne.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2020 Sep
Mass (g):310
Pieces:16
Class:Eucrite-an
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):47.0-54.4; 20.3-22.7
Wollastonite (mol%):1.5-3.4; 43.1-44.2
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):20.4
Type spec location:UWB
Main mass:Labenne
Comments:Work name LAB21-9; submitted by A. Irving
Institutions
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7912 approved meteorites from (Northwest Africa) (plus 1974 unapproved names)

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