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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:help 723 g
Classification
  history:
Recommended:  R3    [explanation]

This is 1 of 34 approved meteorites classified as R3.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 3)
Comments: Approved 21 Sep 2019
Writeuphelp
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 Fa19.6±8.9 (Fa4.7-36.6); n=22. Mean low-Ca pyroxene composition Fs5.9±2.8 Wo0.8±0.5 (Fs1.8-11.8 Wo0.3-2.3); n=19. Mean olivine composition in fine-grained matrix (not included in olivine statistics) Fa47.5±0.8 (Fa46.7-49.0); 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, in preparation (2019)
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Photos:
CreditPhotos
Public domain photographs:
Knut Metzler   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7035 approved meteorites from (Northwest Africa) (plus 2000 unapproved names)

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