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Northwest Africa 10154
Basic information Name: Northwest Africa 10154
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10154
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 1504 g
Meteoritical Bulletin:  MB 105  (2016)  Diogenite-an
Recommended:  Diogenite-an    [explanation]

This is 1 of 9 approved meteorites classified as Diogenite-an.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 19 Apr 2016
Writeup from MB 105:

Northwest Africa 10154 (NWA 10154)

(Northwest Africa)

Purchased: 2015 February

Classification: HED achondrite (Diogenite, anomalous)

History: Discovered in January 2015 at the border of Western Sahara and the southeastern corner of the Al Hamada region. Purchased from a dealer in Mauritania.

Physical characteristics: One piece with no fusion crust present. A saw-cut surface shows pale green pyroxene crystals up to 1-cm in size. Numerous dark-gray patches of maskelynite are observed throughout.

Petrography: (C. Agee, UNM) Orthopyroxene makes up approminately 70% of this meteorite, followed by ~20% plagioclase and 5-10% clinopyroxene. The pyroxene is heavily fractured with many cleavage partings, The plagioclase composition domains appear smooth and unfractured in BSE images, consistent with maskelynite. Accessory troilite, Low-Ni metal, iron oxide, and chromite were observed. Thin calcite weathering veins are present.

Geochemistry: (C. Agee and N. Muttik, UNM) orthopyroxene Fs32.6±0.3Wo3.4±0.5, Fe/Mn=30±1, n=14; clinopyroxene Fs14.2±0.0Wo43.5±0.5, Fe/Mn=25±1, n=3; plagioclase (maskelynite) An93.7±0.4Ab5.8±0.4Or0.4±0.1, n=10. Oxygen isotopes (K. Ziegler, UNM) laser fluorination of acid-washed bulk subsamples gave (average) respectively, δ17O = 1.332, δ18O = 3.086, Δ17O = -0.305 ‰ (linearized).

Classification: This is an equilibrated, unbrecciated, gabbronoritic diogenite with anomalously low ?17O and ?18O, and an anomalously high percentage of plagioclase or maskelynite.

Specimens: 22.5 g including a probe mount on deposit at UNM, DPitt holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2015 February
Mass (g):1504
Shock stage:high
Weathering grade:moderate
Ferrosilite (mol%):32.6±0.3, 14.2±0.0
Wollastonite (mol%):3.4±0.5, 43.5±0.5
Classifier:C. Agee, UNM
Type spec mass (g):22.5
Type spec location:UNM
Main mass:DPitt
Comments:Field name MAC-116; submitted by C. Agee
Plots: O isotopes:  
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
Find references in NASA ADS:
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     This is 1 of 9776 approved meteorites from (Northwest Africa) (plus 1862 unapproved names)

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