Meteoritical Bulletin: Entry for Northwest Africa 13998

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Northwest Africa 13998

Basic information

Name: Northwest Africa 13998
This is an OFFICIAL meteorite name.
Abbreviation: NWA 13998
Observed fall: No
Year found: 2009
Country: (Northwest Africa)
Mass: 31 g

Classification
history:

Recommended:

CK5 [explanation]

This is 1 of 192 approved meteorites classified as CK5. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites

Comments:

Approved 21 Jun 2021

Writeup

help

Writeup from MB 110:

Northwest Africa 13998 (NWA 13998)

(Northwest Africa)

Purchased: 2009 Jun

Classification: Carbonaceous chondrite (CK5)

History: Purchased from a Moroccan mineral dealer at the meteorite show in Ensisheim, France

Petrography: (K. Metzler, IfP) Chondrules, chondrule fragments, and CAIs are embedded in a recrystallized dark gray matrix, which is interspersed with magnetite, troilite, and pentlandite grains. The range of apparent sizes of most chondrules is 300-1300 µm (up to 2.5 mm).

Geochemistry: Mineral compositions and geochemistry: The mean composition of randomly chosen olivine is Fa_27.9±0.8(Fa_26.5-29.0; n=13) with mean Ni concentration of 0.3 wt%. Random measurements of pyroxene grains revealed Fs_8.0±0.6Wo_46.4±0.8(Fs_7.3-9.1Wo_45.1-47.8); n=12. The mean composition of feldspar is An_39.5±4.7Or_3.1±0.7(An_35.9-47.7Or_2.1-3.9); n=5. Magnetite is the most abundant opaque phase and shows significant concentrations of elements other than Fe: MgO 0.2-0.5 wt%; Al₂O₃ 2.7-3.0 wt%; TiO₂ 0.5-0.7 wt%; Cr₂O₃ 6.0-6.2 wt%; NiO 0.1-0.3 wt% (n=3).

Classification: CK chondrite based on mineral chemistry. Petrologic type 5 based on the visibility of chondrules, but equilibrated state of olivine and pyroxene.

Data from:
  MB110
  Table 0
  Line 0:

Place of purchase:	Ensisheim, France
Date:	P 2009 Jun
Mass (g):	31
Pieces:	1
Class:	CK5
Shock stage:	C-S3
Weathering grade:	low
Fayalite (mol%):	27.9±0.8
Ferrosilite (mol%):	8.0±0.6
Wollastonite (mol%):	46.4±0.8
Classifier:	K. Metzler, IfP
Type spec mass (g):	6.5
Type spec location:	IfP
Main mass:	Anonymous
Comments:	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. 110, in preparation (2021)

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 8394 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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