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Northwest Africa 12565
Basic information Name: Northwest Africa 12565
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12565
Observed fall: No
Year found: 2012
Country: Morocco
Mass:help 143.2 g
Meteoritical Bulletin:  MB 108  (2020)  CV3
Recommended:  CV3    [explanation]

This is 1 of 602 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 22 Apr 2019
Writeup from MB 108:

Northwest Africa 12565 (NWA 12565)


Purchased: 2012

Classification: Carbonaceous chondrite (CV3)

History: Purchased by David DGregory in Tucson, 2012. Catalogued at ROM as LM57457

Physical characteristics: Physical Characteristics: Specimen is a 143.7 g light-brown, sub-spherical stone with a thin, glassy fusion crust. On the exposed cut surface, multiple oxidized fractures visibly cross-cut the varying proportions of chondritic material. Few of the larger, mm-sized chondrules have oxidation rims.

Petrography: Specimen contains varying proportions of mm-sized chondrules with igneous rims (avg: 0.95±0.33 mm, n=70), calcium- and aluminum-rich inclusions (CAIs) and sub-mm mineral fragments set in an opaque and crystalline matrix. Chondrules are primarily magnesian, porphyritic, and contain forsterite and low-Ca pyroxene phenocrysts surrounded by feldspathic glass and relatively low amounts of Fe-Ni metal. Modal percentage of components is ~30% for chondrules, ~20% for CAIs, 4.5% for Fe-oxides and remaining is feldspathic glass. Specimen is weakly shocked (S3), determined by presence of intersecting sets of irregular fractures in olivine crystals, undulatory extinction in olivines and pyroxenes, and melt pockets. Minor oxide rims present around metal in chondrules, and small, irregular oxide veins occur throughout the chondritic components, indicative of minor weathering.

Geochemistry: Forsterite in chondrules has a mean composition of Fa3.8±3.8, n=53. Specimen exhibits chemistry from generally Mg-rich cores progressing to more Fe-rich rims. Individual forsterite grains also exhibit chemical heterogeneity, characterized by Mg-rich forsterite cores with progressive Fe enrichment near grain boundaries. Pyroxene in chondrules has a composition of Fs3.4±18.5Wo15.8±5.7, n=73. Pyroxene in chondrules and individual phenocrysts exhibit chemical heterogeneity from relatively Mg-rich cores progressing to Fe enrichment at the boundaries. Metal droplets have taenite Ni content 47.5±2.7). Secondary grains are composed primarily of olivine and pyroxene, and trace amounts of plagioclase. Oxygen isotopes (K. Ziegler, UNM): acid-treated powders gave an average of δ17O=-2.240 ‰; δ18O=2.697 ‰; Δ17O=-3.664 ‰ (N=3).

Classification: Carbonaceous chondrite (CV3). O isotopes plot on a single trend near the CCAM trend line and fall within the CV group. Petrologic type 3 determined by chemical heterogeneity exhibited in olivine and pyroxene-group minerals in chondrules, which have greater than 5% mean deviations, expected for a highly unequilibrated chondrite. Additional characteristics indicative of a type 3 chondrite includes high proportions of monoclinic low-Ca pyroxene phenocrysts in the chondrules, absence of optically resolvable feldspar grains, and taenite Ni content. Chondrules are sharply defined, and the matrix is opaque.

Specimens: The ROM holds the main mass of the sample which weighs 143.17 g. The remaining specimen is composed of two fragments, thin section and a thin section billet.

Data from:
  Table 0
  Line 0:
Place of purchase:Tuscon
Date:P 2012
Mass (g):143.17
Shock stage:S3
Weathering grade:minor
Fayalite (mol%):3.80±3.75 (N=53)
Ferrosilite (mol%):3.40±18.52 (N=73)
Wollastonite (mol%):15.80±5.70
Classifier:M. Duffy, S. Yokoyama (UTorG, ROM)
Type spec mass (g):28.2
Type spec location:ROM
Main mass:ROM
Comments:Submitted by V. Di Cecco, ROM
Plots: O isotopes:  
   and collections
ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011)
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
DGregory: David Gregory, 230 First Avenue, Suite 108, St. Thomas, Ontario N5R 4P5, Canada (private address)
UTorG: University of Toronto, Dept. Geology, Earth Sciences Centre, 22 Russell Street Toronto, Ontario, M5S 3B1, Canada (institutional address; updated 31 Jan 2011)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     This is 1 of 1932 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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