Meteoritical Bulletin: Entry for Northwest Africa 11435

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Northwest Africa 11435

Basic information

Name: Northwest Africa 11435
This is an OFFICIAL meteorite name.
Abbreviation: NWA 11435
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass: 312 g

Classification
history:

Meteoritical Bulletin:	MB 106	(2018)	CK5
Recommended:			CK5 [explanation]

This is 1 of 181 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 13 Oct 2017

Writeup

help

Writeup from MB 106:

Northwest Africa 11435 (NWA 11435)

(Northwest Africa)

Purchased: 2017 May

Classification: Carbonaceous chondrite (CK5)

Petrography: (K. Metzler, IfP) Chondrules with apparent diameters up to 1.3 mm and CAIs are embedded in a fine-grained brownish matrix. Opaques are Cr-bearing magnetite and pentlandite. No metal was found .

Geochemistry: Mineral compositions and geochemistry: Olivine composition Fa_31.7±0.2(31.5-32.2; n=15). Composition of low-Ca pyroxene Fs_26.2±0.5(25.4-27.5); Wo_0.8±0.3(0.5-1.6; n=15). Composition of Ca-rich pyroxene Fs_9.9; Wo_45.7(n=2).The compositional range of feldspar (n=2) is An_38-40.One plagioclase grain in a CAI shows An_86.Most abundant opaques are Magnetite and Pentlandite. No metal was found. Magnetite shows significant concentrations of elements other than Fe (n=4): MgO 0.4 wt%; Al₂O₃ 1.9 wt%; Cr₂O₃ 5.4 wt%.

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

Data from:
  MB106
  Table 0
  Line 0:

Place of purchase:	Boujdour, Morocco
Date:	P 2017 May
Mass (g):	312
Pieces:	1
Class:	CK5
Shock stage:	S2
Weathering grade:	low
Fayalite (mol%):	31.7
Ferrosilite (mol%):	26.2; 9.9
Wollastonite (mol%):	0.8; 45.7
Classifier:	K. Metzler, IfP
Type spec mass (g):	21
Type spec location:	IfP
Main mass:	Nourddine Azelmat, Morocco
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 Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 7885 approved meteorites from (Northwest Africa) (plus 1958 unapproved names)

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