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Northwest Africa 14200
Basic information Name: Northwest Africa 14200
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14200
Observed fall: No
Year found: 2009
Country: (Northwest Africa)
Mass:help 76.8 g
Classification
  history:
Recommended:  C3-ung    [explanation]

This is 1 of 26 approved meteorites classified as C3-ung.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), and Ungrouped chondrites
Comments: Approved 15 Dec 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 14200 (NWA 14200)

Northwest Africa

Purchased: 2009

Classification: Carbonaceous chondrite (C3, ungrouped)

History: In 2009, Jay Piatek purchased a single black 76.8 g meteorite from Aziz Habibi. The stone was reportedly found near Boudnib, north of Erfoud in Morocco. In 2019, the Center for Meteorite Studies acquired 69.9 g of this stone.

Physical characteristics: Single, dark, partially fusion-crusted stone. One side has a shiny sand-blasted surface. Cut surface shows an abundance of light-colored chondrules (largest 2 mm) in a dark grey, friable matrix. A few scattered clasts, largest to 5 mm. Density of a 62.068 g piece measured by the glass-bead method is 2.03 g/cm3.

Petrography: (L. Garvie, ASU) Observation of the polished mounts in the SEM shows the meteorite to be highly brecciated and clast-rich, hosting chondrules and mineral fragments. The matrix, in particular, is brecciated at all spatial scales visible in the SEM. Chondrule sizes measured by optical microscopy from the polished mount is 328±255 microns (n=26). "Shrinkage" cracks are abundant, especially evident in the chondrule fine grained rims and fine-grained matrix clasts. Powder X-ray diffraction patterns acquired from several different areas shows that the stone is dominated by reflections for olivine, clinopyroxene, magnetite (with possible minor maghemite), pyrrhotite, and pentlandite. No reflections for phyllosilicates or tochilinite are present. BSE images show that the majority of the chondrules are dark corresponding to low Fa values, whereas bright, sometimes zoned, high Fa olivine is common in the matrix as fragments and shards. These two olivine populations were further confirmed by the powder X-ray diffraction and microprobe data.

Geochemistry: EPMA (L. Garvie, ASU): Eighteen olivine grains chosen at random on the probe mount, and give Fa20.67±22.04 (n=18). Detailed results: Fa54.5±2.2, n=4; Fa32.4±5.2, n=4; Fa14.7, n=1; and, Fa1.5±1.0, n=9. Olivine contains CaO to 0.7 wt%, Cr2O3 to 0.5 wt%, P2O5 to 0.2 wt%, and NiO to 0.2 wt%. Ferroan olivine contain 0.29±0.12 wt% Cr2O3 (n=9). Low-Ca pyroxene Fs1.4±0.4Wo1.0±0.2 (n=6) and Fs5.7Wo1.2. Oxygen isotopes (K. Ziegler, UNM): Three fragments analyzed by laser fluorination gave δ18O = -0.949, 0.592, -1.423; δ17O = -6.460, -5.606, -5.854; Δ17O = -5.959, -5.918, -5.103 (linearized, all per mil, TFL slope = 0.528).

Classification: C3-ung. Lack of phyllosilicates, presence of zoned olivine, and fine-grained matrix mineralogy consistent with type 3 petrologic grade. The small chondrule size distinguishes this specimen from CV and CK chondrites, and oxygen isotopes rule out affinity to CO or CM chondrites.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2009
Mass (g):76.8
Pieces:1
Class:C3-ung
Weathering grade:low
Fayalite (mol%):20.67±22.04 (n=18)
Classifier:L. Garvie, ASU, K. Ziegler, UNM
Type spec mass (g):69.9
Type spec location:ASU
Main mass:ASU
Finder:Anonymous
Comments:ASU#2137; submitted by L. Garvie
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8674 approved meteorites from (Northwest Africa) (plus 1882 unapproved names)

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