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Northwest Africa 16111
Basic information Name: Northwest Africa 16111
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 16111
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 2.41 kg
Recommended:  Achondrite-ung    [explanation]

This is 1 of 157 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 21 Mar 2024
Writeup from MB 113:

Northwest Africa 16111 (NWA 16111)

(Northwest Africa)

Purchased: April 2021

Classification: Ungrouped achondrite

History: Purchased by Youssef Bennani in April 2021 from a meteorite dealer in Algeria.

Physical characteristics: Single stone with minor fusion crust.

Petrography: (D. Sheikh, Cascadia; A. Love, App) Sample is an ultramafic rock displaying a coarse-grained cumulate texture comprised primarily of olivine, orthopyroxene, clinopyroxene, and plagioclase phenocrysts (average silicate grain size ~0.9 mm, most silicate grain boundaries display 120° triple junctions). Accessory phases identified interstitial to silicate phenocrysts include graphite, Fe-Ni metal, Fe-oxides, chromite, and Cr-bearing sulfide.

Geochemistry: (A. Love, App) Olivine cores Fa0.5±0.3, Fe/Mn=17.8±24.0, CaO 0.06±0.02 wt.%, Cr2O3 0.02±0.01 wt% (n=12), low-Ca Pyroxene rims (Fs11.7±3.3Wo0.5±0.1, Fe/Mn=11.9±2.6, n=9), high-Ca Pyroxene (Fs11.2±0.2Wo44.1±0.3, Fe/Mn=40.4±3.3, n=12), non-stoichiometric plagioclase (An46.4±5.9Or0.1±0.1, n=8). Oxygen isotopes: (R. C. Greenwood, OU) δ17O = 4.173, δ18O = 8.357, Δ17O = -0.173 (all ‰).

Classification: Achondrite, ungrouped. Textural, chemical, and isotopic data are unlike other achondrites.

Specimens: 21.9 g at Cascadia, main mass with Youssef Bennani.

Data from:
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P April 2021
Mass (g):2410
Shock stage:low
Weathering grade:low
Fayalite (mol%):0.5±0.3
Ferrosilite (mol%):11.7±3.3, 11.2±0.2
Wollastonite (mol%):0.5±0.1, 44.1±0.3
Classifier:D. Sheikh, Cascadia; A. Love, App
Type spec mass (g):21.9
Type spec location:Cascadia
Main mass:Youssef Bennani
Comments:CML 1559; K53-015; submitted by Daniel Sheikh
Plots: O isotopes:  
   and collections
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
References: Published in Meteoritical Bulletin, no. 113, in preparation (2024)
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Public domain photographs:
Daniel Sheikh      

     This is 1 of 9829 approved meteorites from (Northwest Africa) (plus 1851 unapproved names)

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