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Northwest Africa 12416
Basic information Name: Northwest Africa 12416
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12416
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 875 g
Classification
  history:
Recommended:  C3-ung    [explanation]

This is 1 of 16 approved meteorites classified as C3-ung.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), and Ungrouped chondrites
Comments: Approved 27 Jul 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12416 (NWA 12416)

(Northwest Africa)

Purchased: 2018 Jul

Classification: Carbonaceous chondrite (C3, ungrouped)

History: The first batch of this material was purchased by Adam Aaronson in July 2018 in Temara, Morocco; subsequently additional material was purchased from the same Moroccan source by Mark Lyon and others.

Physical characteristics: The material consists of numerous small black, friable stones, some completely fusion crusted (total weight 875 g).

Petrography: (A. Irving and S. Kuehner, UWS; L. Garvie, ASU) Granular chondrules (apparent diameter 350±210 µm, N = 15) together with sparse mineral fragments and AOA (but no identifiable CAI or related mineral grains) are set in very fine grained matrix (~50 vol.%, black in thin section) containing minor kamacite and pentlandite. No phyllosilicates were detectable by X-ray diffraction.

Geochemistry: Olivine (Fa1.0-67.1, N = 3), orthopyroxene (Fs1.7-4.3Wo0.9-3.1, N = 2), clinopyroxene (Fs1.1Wo23.2). Oxygen isotopes (K. Ziegler, UNM) Analyses of acid-washed subsamples by laser fluorination gave, respectively, δ17O -10.290, -0.181, -11.117; δ18O -6.827, 7.352, -7.023; Δ17O -6.685, -4.063, -7.409 per mil.

Classification: Carbonaceous chondrite (ungrouped Type 3). Oxygen isotope compositions plot at more negative Δ17O values than for CV, CK and most CM chondrites, and the absence of phyllosilicates excludes affinity to typical CM2 chondrites.

Specimens: 20.1 g including one polished thin section at UWB; 152 g at ASU; 361 g with Mr. M. Lyon; 137 g with Mr. M. Ouzillou; 205 g with Mr. A. Aaronson.

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Temara
Date:P 2018 Jul
Mass (g):875
Pieces:many
Class:C3-ung
Shock stage:low
Weathering grade:low
Fayalite (mol%):1.0-67.1
Ferrosilite (mol%):1.7-4.3
Wollastonite (mol%):0.9-3.1
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.1
Type spec location:UWB
Main mass:A. Aaronson/M. Lyon/M. Ouzillou
Comments:Work name M2151; submitted by A. Irving
Plots: O isotopes:  
Institutions
   and collections
ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6877 approved meteorites from (Northwest Africa) (plus 2037 unapproved names)

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