Meteoritical Bulletin: Entry for Northwest Africa 12858

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Northwest Africa 12858

Basic information

Name: Northwest Africa 12858
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12858
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass: 723 g

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	R3
Recommended:			R3 [explanation]

This is 1 of 69 approved meteorites classified as R3. [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 3)

Comments:

Approved 21 Sep 2019

Writeup

Writeup from MB 108:

Northwest Africa 12858 (NWA 12858)

(Northwest Africa)

Purchased: 2019 May

Classification: Rumuruti chondrite (R3)

Petrography: (K. Metzler, IfP) Unequilibrated chondrite, consisting of well-preserved chondrules and chondrule fragments set in a fine-grained matrix which is dominated by equilibrated olivine.

Geochemistry: Mineral compositions and geochemistry: Mean olivine composition Fa_19.6±8.9(Fa_4.7-36.6); n=22. Mean low-Ca pyroxene composition Fs_5.9±2.8Wo_0.8±0.5(Fs_1.8-11.8Wo_0.3-2.3); n=19. Mean olivine composition in fine-grained matrix (not included in olivine statistics) Fa_47.5±0.8(Fa_46.7-49.0); n=7. Accessories are troilite and pentlandite; no metal was found.

Classification: R chondrite based on mineral chemistry. Petrologic type 3 based on unequilibrated olivine and pyroxene.

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Guelmim, Morocco
Date:	P 2019 May
Mass (g):	723
Pieces:	1
Class:	R3
Shock stage:	S3
Weathering grade:	W2
Fayalite (mol%):	19.6±8.9
Ferrosilite (mol%):	5.9±2.8
Wollastonite (mol%):	0.8±0.5
Classifier:	K. Metzler, IfP
Type spec mass (g):	20
Type spec location:	IfP
Main mass:	Nor Eddine 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 Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150

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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Domjan Svilkovic
Public domain photographs:
Knut Metzler

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

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