Meteoritical Bulletin: Entry for Northwest Africa 5500

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Northwest Africa 5500

Basic information

Name: Northwest Africa 5500
This is an OFFICIAL meteorite name.
Abbreviation: NWA 5500
Observed fall: No
Year found: 2007
Country: (Northwest Africa)
Mass: 118 g

Classification
history:

Recommended:

CK3 [explanation]

This is 1 of 91 approved meteorites classified as CK3. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CK chondrites, CK3 chondrites, and CV-CK clan chondrites

Comments:

Approved 19 Jul 2024

Writeup

help

Writeup from MB 113:

Northwest Africa 5500 (NWA 5500)

(Northwest Africa)

Purchased: 2007 Sep

Classification: Carbonaceous chondrite (CK3)

History: Purchased by Marcin Cimala in September 2007 from a Moroccan dealer.

Petrography: (A. Irving, UWS, and J. Boesenberg, BrownU) Well-defined unequilibrated chondrules (apparent diameter 1090±720 µm, N = 26) containing Cr-magnetite and devitrified glass are set in a fine-grained opaque matrix (~40 vol.%) containing Cr-magnetite, kamacite (altered to Fe oxides) and taenite. Minerals in CAI include diopside, anorthite, spinel and perovskite.

Geochemistry: Olivine (Fa_9.6±16.1, range Fa_0.2-56.2, N = 15), low-Ca pyroxene (Fs_1.0±0.2Wo_2.6±2.2, range Fs_0.8-1.3Wo_0.9-5.4, N = 5), pigeonite (Fs_1.3±3.2Wo_9.4±2.3, range Fs_1.3-3.2Wo_11.0-7.8, N = 2), subcalcic augite (Fs_0.7Wo_33.0), augite (Fs_1.2±0.6Wo_39.9±0.5, range Fs_0.8-1.7Wo_40.2-39.6, N = 2), diopside (Fs_0.4±0.1Wo_50.1±0.8, range Fs_0.3-0.6Wo_49.2-50.8, N = 3), magnetite (Cr₂O₃ 4.7±1.9 wt.%, N = 6).

Classification: Carbonaceous chondrite (CK3).

Specimens: 21.1 g including one polished thin section at YPMNH; remainder with Mr. M. Cimala.

Data from:
  MB113
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2007 Sep
Mass (g):	118
Pieces:	1
Class:	CK3
Shock stage:	S2
Weathering grade:	low
Fayalite (mol%):	9.6±16.1
Ferrosilite (mol%):	1.0±0.2
Wollastonite (mol%):	1.6±0.2
Classifier:	A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):	21.1
Type spec location:	YPMNH
Main mass:	M. Cimala
Comments:	Work names TB1246 and MC056; submitted by A. Irving

Institutions
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)
YPMNH: Yale University Peabody Museum of Natural History P.O. Box 208118 New Haven, CT 06520-8118 , United States; Website (institutional address; updated 30 Aug 2014)
BrownU: Brown University Dept of Earth, Environmental and Planetary Sciences (DEEPS) 324 Brook Street Providence, RI 02912 , United States (institutional address; updated 21 Jul 2024)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 113, in preparation (2024)

Find references in NASA ADS:
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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9933 approved meteorites from (Northwest Africa) (plus 1837 unapproved names)

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