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Northwest Africa 13176
Basic information Name: Northwest Africa 13176
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13176
Observed fall: No
Year found: 2019
Country: Algeria
Mass:help 223 g
Classification
  history:
Recommended:  Diogenite    [explanation]

This is 1 of 439 approved meteorites classified as Diogenite.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 28 Mar 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13176 (NWA 13176)

Algeria

Find: 2019

Classification: HED achondrite (Diogenite)

History: Three samples weighing (91.79, 56.39, 74.3 7g) were found in the desert near Tindouf, Algeria, in March 2019. Dave Lehman and a partner acquired the samples from the collector.

Physical characteristics: Samples are irregularly shaped and are partially covered with a black, wind-ablated fusion crust. One sample shows flight orientation with weak flow lines and frothy fusion crust covering the crusted portions of the sample. The uncrusted portions with fractured surfaces are light greenish colored.

Petrography: Description and classification (A. Love, App) Sample is a cataclastic breccia composed of dominant lath-shaped orthopyroxene up to ~9 mm and augite. Additional minerals are (~3 vol%) twinned plagioclase (with an average length of 529µm), chromite, troilite, a silica polymorph and rare K-feldspar (Or98An1.8).

Geochemistry: (A. Love, App): Low Ca pyroxene (Fs24.1±0.2Wo2.0±0.5, Fe/Mn=27.6±0.3, Mg#75.4±0.2, n=10); high Ca pyroxene (Fs7.8±0.3Wo45.8±0.4, Fe/Mn=21.7±1.8, n=5); plagioclase (An83.8±2.1Or0.2±0.1, n=3).

Classification: HED achondrite (Diogenite). Textures, mineralogy and Fe/Mn ratios of pyroxenes suggest this sample is a diogenite breccia. Weathering grade is low.

Specimens: Dave Lehman and a partner hold the main masses. An endcut and 2 slices weighing 20.97 g and a polished thin section are on deposit at App.

Data from:
  MB109
  Table 0
  Line 0:
Date:2019
Mass (g):222.52
Pieces:3
Class:Diogenite
Shock stage:moderate
Weathering grade:low
Ferrosilite (mol%):24.1±0.2; 7.8±0.3
Wollastonite (mol%):2.0±0.5; 45.8±0.4
Magnetic suscept.:2.93
Classifier:A. Love, App
Type spec mass (g):20.97
Type spec location:App
Main mass:Dave Lehman
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1003 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)

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