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Northwest Africa 15634
Basic information Name: Northwest Africa 15634
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15634
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 101 g
Recommended:  CV3    [explanation]

This is 1 of 605 approved meteorites (plus 1 unapproved name) classified as CV3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CV chondrites, and CV-CK clan chondrites
Comments: Approved 23 Feb 2023
Writeup from MB 112:

Northwest Africa 15634 (NWA 15634)

(Northwest Africa)

Purchased: 2022 Jun

Classification: Carbonaceous chondrite (CV3)

History: Purchased by Shun-Chung Yang in June 2022 from a dealer in Erfoud, Morocco.

Petrography: (A. Irving, UWS and J. Boesenberg, BrownU) Relatively large well-formed, unequilibrated chondrules (some with multiple rims, apparent diameter 1030 ± 550 µm, N = 25) and large fine-grained CAI are set in a fine grained matrix (~40 vol.%, orange-brown in thin section) containing Cr magnetite, augite, intermediate plagioclase (and some glass of similar composition), rare troilite and minor secondary barite. Mineral phases identified in CAI include gehlenite, anorthite, diopside, spinel, hedenbergite and sodalite.

Geochemistry: Olivine (Fa15.8±15.3, range Fa0.3-38.7, N = 20), low-Ca pyroxene (Fs2.8±1.2Wo0.9±0.1, range Fs1.3-3.8Wo0.8-1.0, N = 4), subcalcic augite (Fs2.1±0.5Wo36.4±2.1, range Fs1.8-2.5Wo37.9-35.0, N = 2), augite (Fs5.6±6.9Wo46.0±1.9, range Fs0.4-15.6Wo43.8-48.0, N = 5), plagioclase (Ab83.9-92.2An15.3-6.0Or0.9-1.8, N = 2), magnetite (Cr2O3 1.4-2.9 wt.%, N = 7). Mineral phases in CAI: diopside (Fs1.5Wo48.0, Al2O3 1.3 wt.%), anorthite (An98.9Or0.0).

Classification: Carbonaceous chondrite (CVox3).

Specimens: 20.3 g including one polished thin section at UWB; remainder with Mr. S.-C. Yang.

Data from:
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2022 Jun
Mass (g):101
Shock stage:S2
Weathering grade:low
Fayalite (mol%):15.8±15.3
Ferrosilite (mol%):2.8±1.2
Wollastonite (mol%):0.9±0.1
Classifier:A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):20.3
Type spec location:UWB
Main mass:S.-C. Yang
Comments:Work name SCY-78; submitted by A. Irving
   and collections
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)
BrownU: Brown University Providence, RI 02912, United States (institutional address; updated 7 Sep 2019)
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
Find references in NASA ADS:
Find references in Google Scholar:

     This is 1 of 9042 approved meteorites from (Northwest Africa) (plus 1870 unapproved names)

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