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Northwest Africa 11777
Basic information Name: Northwest Africa 11777
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11777
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 705 g
Meteoritical Bulletin:  MB 107  (2018)  Eucrite
Recommended:  Eucrite    [explanation]

This is 1 of 569 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 7 Jun 2018
Writeup from MB 107:

Northwest Africa 11777 (NWA 11777)

(Northwest Africa)

Purchased: 2017

Classification: HED achondrite (Eucrite)

History: One mostly crusted stone weighing 705 g was found in Morocco prior to 2017. J. Donald Cline and John Sinclair acquired the sample from a meteorite dealer at the Tucson Gem and Mineral Show in February of 2017.

Physical characteristics: Sample is rounded to irregularly shaped and contains many narrow and broad, shallow regmaglypts on 1/3 of its surface. Sample is ~85% covered by orange brown to dark brown patina, some of which may be original fusion crust. Fractures within the patina show a light-colored interior with fine-grained basaltic texture.

Petrography: Description and classification (A. Love, App): Sample is a breccia composed of up to 1 cm, rounded to irregularly shaped, ophitic, cumulate textured clasts and subophitic basaltic textured clasts. Clasts are set within a matrix of granular eucritic debris. Pyroxenes are exsolved. Minerals: orthopyroxene, Ca-pyroxene, ilmenite, phosphates, SiO2 polymorph, FeS.

Geochemistry: (A. Love, App) Eucrite: low-Ca pyroxene Fs61.2±0.5Wo2.5±0.4 (Fs60.2-62.1Wo2.0-3.2, FeO/MnO=29.4-31.1, N=14); high-Ca pyroxene exsolution lamellae Fs26.4±0.7Wo44.2±0.6 (Fs25.1-27.8Wo42.9-44.9, FeO/MnO=29.6-32.0, N=14); plagioclase (An88.0±2.0Or0.0 (An85.2-91.9Or0.0, N=14);

Classification: HED (equilibrated basaltic eucrite) Original igneous textures within clasts are preserved while major element compositions of pyroxenes within sample are equilibrated. Plagioclase compositions are poorly equilibrated.

Specimens: PARI holds the main mass. One 20 g endcut and a polished thin section are on deposit at App.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson Gem and Mineral Show
Date:P 2017
Mass (g):705
Shock stage:moderate
Weathering grade:low
Ferrosilite (mol%):61.2±0.5; 26.4±0.7
Wollastonite (mol%):2.5±0.4; 44.2±0.6
Classifier:A. Love, App
Type spec mass (g):20
Type spec location:App
Main mass:PARI
Comments:Submitted by Anthony Love
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
PARI: Pisgah Astronomical Research Institute 1 Pari Dr Rosman, NC 28772, United States (institutional address; updated 13 Sep 2016)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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     This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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