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Northwest Africa 13288
Basic information Name: Northwest Africa 13288
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13288
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 633 g
Classification
  history:
Recommended:  Eucrite    [explanation]

This is 1 of 468 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 2 May 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13288 (NWA 13288)

(Northwest Africa)

Purchased: 2019

Classification: HED achondrite (Eucrite)

History: Marc Jost (SJS) purchased the 633 g sample in June 2019 from Aziz Mouadine at the St. Marie aux Mines show, France.

Physical characteristics: Approximately 40% of this irregular-shaped stone is coated by a dark-brown, weathered fusion crust. The cut face shows the sample is a breccia composed of light- to dark-gray, cm-sized igneous-textured clasts.

Petrography: Description and classification (A. Love, App) Sample is a breccia composed of irregularly shaped, up to 3 cm, porphyritic (32 vol%) to basaltic (13 vol%) textured eucrite clasts, diogenite clasts (5 vol%) and vitrophyric shock-melted clasts (10 vol%) surrounded by a comminuted matrix of similar materials. Porphyritic eucrites display quenched textures composed of subequal amounts of up to 1 mm to 1 cm long, prismatic, hollow weakly-zoned, low-Ca pyroxene ("soda straw" texture) phenocrysts set within variolitic textured groundmass of 0.5 mm euhedral plagioclase laths. Basaltic clasts display intersertal texture composed of similar pyroxene morphologies and larger (1 mm avg. long dimension) skeletal - lath-shaped plagioclase that occur in a radial arrangement around pyroxenes. Diogenite occurs as unbrecciated, mosaicized crystalline fragments and a brecciated olivine and plagioclase-bearing lithology. Accessory minerals are a silica polymorph, ilmenite, chromite, troilite and phosphates.

Geochemistry: (A. Love, App): Diogenite: low Ca-pyroxene (Fs34.2±4.1Wo3.4±0.6, Mg#64.5±4.4, Fe/Mn=31.3±0.8, n=6); olivine (Fa43.0, Fe/Mn=45.9, n=1). Basaltic clast: pigeonite (Fs40.1±3.1Wo16.3±5.0, Mg#52.5±1.7, Fe/Mn=28.1±0.1, n=3); plagioclase (An93.4±1.4Or0.1±0.1, n=2). Quenched clasts: pigeonite (Fs43.8±2.4Wo8.2±2.2, Mg#52.2±3.0, Fe/Mn=27.8±0.8, n=6); augite (Fs24.1Wo40.2, Fe/Mn=25.7, n=1); plagioclase (An81.4±2.8Or1.2±0.4, n=8).

Classification: HED achondrite (polymict eucrite breccia). Based on textures and Fe/Mn ratios within pyroxenes, this sample is an HED breccia. Clast lithologies suggest this is a polymict eucrite breccia, low weathering level, MS-2 (Stöffler et al., 2018).

Specimens: Marc Jost (SJS) holds the main mass. A single slice weighing 21.88 g and a polished thin section and mount are on deposit at App.

Bibliography:
  • Stöffler D., Hamann C., and Metzler K. (2018) Shock metamorphism of planetary silicate rocks and sediments: Proposal for an updated classification system. Meteorit. Planet. Sci. 53, 5-49. (link)
Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:St. Marie aux Mines Mineral Show
Date:P 2019
Mass (g):633.2
Pieces:1
Class:Eucrite
Shock stage:low
Weathering grade:low
Fayalite (mol%):43
Ferrosilite (mol%):34.2±4.1; 40.1±3.1; 43.8±2.4; 24.1
Wollastonite (mol%):3.4±0.6; 16.3±5.0; 8.2±2.2; 40.2
Magnetic suscept.:2.72
Classifier:A. Love, App
Type spec mass (g):21.9
Type spec location:App
Main mass:Marc Jost (SJS)
Finder:Unknown
Comments:Submitted by Anthony Love
Institutions
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
SJS: Space Jewels Switzerland, 2555 Brügg, Switzerland (private address; updated 3 Jan 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Anthony Love   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7269 approved meteorites from (Northwest Africa) (plus 1987 unapproved names)

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