Meteoritical Bulletin: Entry for Northwest Africa 4679

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Northwest Africa 4679

Basic information

Name: Northwest Africa 4679
This is an OFFICIAL meteorite name.
Abbreviation: NWA 4679
Observed fall: No
Year found: 2006
Country: (Northwest Africa)
Mass: 735 g

Classification
history:

Meteoritical Bulletin:	MB 105	(2016)	CK4
Recommended:			CK4 [explanation]

This is 1 of 129 approved meteorites classified as CK4. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites

Comments:

Approved 18 Nov 2016

Writeup

Writeup from MB 105:

Northwest Africa 4679 (NWA 4679)

(Northwest Africa)

Purchased: 2006 May

Classification: Carbonaceous chondrite (CK4)

Petrography: (K. Metzler, IfP) Chondrules and CAIs (up to 6 mm) are embedded in a fine-grained brownish matrix. Mean apparent chondrule size 1.4±0.5 mm (0.2-2.9 mm; n=63). The sample is interspersed with magnetite nodules.

Geochemistry: Random olivine measurements revealedFa_32.2±0.6(Fa_31.3-33.0; n=14). One BO chondrule with igneous rim shows a relict unequilibrated core with Fa_7.9.The compositional range of feldspar is An_17.3-35.1(n=4). Magnetite is the most abundant opaque phase and shows significant concentrations of elements other than Fe (n=3): MgO 1.9-2.0 wt%; Al₂O₃ 3.4-4.0 wt%; TiO₂ 0.8-0.9 wt%; Cr₂O₃ 2.9-3.6 wt%; NiO 0.3-0.5 wt%.

Classification: CK chondrite based on mineral chemistry. Petrologic type 4 based on the chemical variation of olivine and pyroxene.

Data from:
  MB105
  Table 0
  Line 0:

Place of purchase:	Erfoud, Morocco
Date:	P 2006 May
Mass (g):	735
Pieces:	1
Class:	CK4
Shock stage:	S1
Weathering grade:	moderate
Fayalite (mol%):	32.2±0.6 (31.3-33.0; n=14)
Ferrosilite (mol%):	25.7±1.3 (23.8-28.9; n=13)
Wollastonite (mol%):	1.1±0.4 (0.5-2.0; n=13)
Classifier:	K. Metzler, IfP
Type spec mass (g):	20
Type spec location:	IfP
Main mass:	Carsten Giessler, Germany
Comments:	Originally submitted by Ray Pickard; submitted by K. Metzler (IfP)

Institutions
and collections

IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full

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Photos:

Credit	Photos
Photos from the Encyclopedia of Meteorites:
Gipo Meteorites

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9921 approved meteorites from (Northwest Africa) (plus 1838 unapproved names)

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