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Northwest Africa 14691
Basic information Name: Northwest Africa 14691
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14691
Observed fall: No
Year found: 2021
Country: Algeria
Mass:help 159.3 g
Classification
  history:
Meteoritical Bulletin:  MB 111  (2023)  Diogenite
Recommended:  Diogenite    [explanation]

This is 1 of 545 approved meteorites classified as Diogenite.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 19 Mar 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 14691 (NWA 14691)

Algeria

Purchased: 2021

Classification: HED achondrite (Diogenite)

History: Fabien Kuntz purchased the 159.3 g stone from a dealer in Tindouf, Algeria, in December 2021.

Physical characteristics: The exterior is greenish brown in color and shows a crystalline texture devoid of fusion crust. The interior is yellowish-green and green colored crystals of two distinct grainsizes.

Petrography: Description and classification (A. Love, App) The sample is composed of coarse-grained (avg. grain size 2969 μm, n=10) allotriomorphic granular-textured regions of orthopyroxene surrounded by finer-grained (avg. grain size =356 μm, n=50) granoblastic regions of pyroxene and rounded to elongate olivine (avg. grain size 64 μm, n=14) that occurs interstitial to and as chadacrysts enclosed within pyroxene (similar to GRA98108). Additional minerals are: chromite, plagioclase, troilite. Modal abundances (vol%): Opx (85); Ol(9); plag (3); chromite (1) and troilite (1).

Geochemistry: (A. Love, App) Olivine (Fa27.4±0.5, Fe/Mn=42.6±1.6, n=10); low Ca pyroxene (Fs23.1±0.6Wo3.4±0.5, Fe/Mn=27.5±0.9, Mg#=76.0±0.7, n=12). Plagioclase (An89.5±1.5Or0.3±0.1, n=8).

Classification: HED achondrite (Olivine-bearing diogenite) Based on mineralogy, modal abundance of olivine, Mg# of Fe/Mn ratios of Opx, sample is a diogenite.

Specimens: Fabien Kuntz holds the main mass. A polished thin section and an endcut and slice weighing 20.2 g are on deposit at App.

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Tindouf
Date:P 2021
Mass (g):159.3
Pieces:1
Class:Diogenite
Shock stage:low
Weathering grade:low
Fayalite (mol%):27.4±0.5
Ferrosilite (mol%):23.1±0.6
Wollastonite (mol%):3.4±0.5
Classifier:A. Love, App
Type spec mass (g):20.2
Type spec location:App
Main mass:Fabien Kuntz
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)
Kuntz: Fabien Kuntz, France; Website (private address)
Catalogs:
References: Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
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Photos:
CreditPhotos
Public domain photographs:
Anthony Love   
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1399 approved meteorites from Algeria (plus 33 unapproved names) (plus 4 impact craters)

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