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Northwest Africa 15642
Basic information Name: Northwest Africa 15642
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15642
Observed fall: No
Year found: 2012
Country: (Northwest Africa)
Mass:help 568 g
Classification
  history:
Meteoritical Bulletin:  MB 112  (2023)  LL3
Recommended:  LL3    [explanation]

This is 1 of 492 approved meteorites classified as LL3.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 29 Jan 2023
Writeuphelp
Writeup from MB 112:

Northwest Africa 15642 (NWA 15642)

(Northwest Africa)

Purchased: 2012

Classification: Ordinary chondrite (LL3)

History: Purchased from a Moroccan mineral dealer at the mineral show in Sainte-Marie-aux-Mines, France

Physical characteristics: Individual stone with ~80% black fusion crust

Petrography: (K. Metzler, IfP) Unbrecciated ordinary chondrite of low petrologic type, consisting of closely packed chondrules with very low amounts of interchondrule matrix. In some areas a cluster chondrite texture can be observed. The mean apparent chondrule size of 87 measured chondrules is 602±295 µm (250-1740 µm). Some chondrules with sizes up to ~9 mm occur. Accessory phases are Fe-Ni metal and troilite, mostly residing outside of chondrules.

Geochemistry: Mineral compositions and geochemistry: The mean olivine composition is Fa25.6±8.2 (Fa1.2-32.5; n=30); the mean low-Ca pyroxene composition is Fs11.2±6.9Wo0.9±0.5 (Fs1.8-25.8Wo0.3-1.8; n=9).

Classification: LL chondrite, based on low metal content, mineral chemistry, and mean apparent chondrule size. Petrographic type 3, based on the large chemical variation of olivine and pyroxene. Estimated petrographic subtype 3.6 based on the PMD of Fa values: 32.1%.

Data from:
  MB112
  Table 0
  Line 0:
Place of purchase:Sainte-Marie-aux-Mines, France
Date:P 2012
Mass (g):568
Pieces:1
Class:LL3
Shock stage:C-S3
Weathering grade:W0/1
Fayalite (mol%):25.6±8.2
Ferrosilite (mol%):11.2±6.9
Wollastonite (mol%):0.9±0.5
Classifier:K. Metzler, IfP
Type spec mass (g):20
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. 112, in preparation (2023)
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Photos:
CreditPhotos
Public domain photographs:
Knut Metzler         
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9776 approved meteorites from (Northwest Africa) (plus 1862 unapproved names)

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