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Northwest Africa 13577
Basic information Name: Northwest Africa 13577
     This is NOT an official name: Discredited meteorite.
Abbreviation: NWA 13577
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 29.7 g
Classification
  history:
Recommended:  L3    [explanation]

Comments: Entered 28 Nov 2020
Revised 18 Dec 2020: Duplicate meteorite of NWA 13262
Writeuphelp
Writeup from MB 109:

Northwest Africa 13577 (NWA 13577)

(Northwest Africa)

Purchased: 2016

Classification: Ordinary chondrite (L3)

Petrography: (I. Kerraouch; A. Bischoff, IfP) Chondrules, chondrule fragments, and alteration products (mainly of metal and sulfides) are embedded in a fine-grained, brownish matrix, which has an abundance of about 10-15 vol%. The majority of chondrules are porphyritic in texture and the mean apparent chondrule size is about 500 µm. The sample is heavily weathered (W3-4).

Geochemistry: (K. Klemm; A. Bischoff, IfP) Mineral compositions and geochemistry: Random measurements of olivine grains revealed Fa16.3±10.4 (Fa1.1-33.0); n=21. Random measurements of low-Ca pyroxene grains revealed Fs7.9±7.4Wo0.5±0.4 (Fs1.1-25.4Wo0.1-1.7); n=17.

Classification: L3 chondrite based on the chondrule size, chondrule-matrix ratio, texture, and unequilibrated mineral chemistry.

Specimens: 23.7 g, M. Zolensky, 6 g, IfP

Data from:
  MB109
  Table 0
  Line 0:
Date:P 2016
Mass (g):29.7
Pieces:1
Class:L3
Shock stage:S2
Weathering grade:W3-4
Fayalite (mol%):16.3±10.4 (n=21)
Ferrosilite (mol%):7.9±7.4 (n=17)
Wollastonite (mol%):0.5±0.4 (n=17)
Classifier:K. Klemm, I. Kerraouch, A. Bischoff, IfP
Type spec mass (g):6
Type spec location:IfP
Main mass:M. Zolensky
Comments:Working No. NWA 4-17; submitted by Imene Kerraouch
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. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

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