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Northwest Africa 15942
Basic information Name: Northwest Africa 15942
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15942
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 657 g
Classification
  history:
Meteoritical Bulletin:  MB 112  (2023)  Eucrite-melt breccia
Recommended:  Eucrite-melt breccia    [explanation]

This is 1 of 106 approved meteorites classified as Eucrite-melt breccia.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 10 Jun 2023
Writeuphelp
Writeup from MB 112:

Northwest Africa 15942 (NWA 15942)

(Northwest Africa)

Purchased: 2020

Classification: HED achondrite (Eucrite, melt breccia)

Petrography: (K. Metzler, IfP) Clast-rich melt rock, consisting of mm- to cm-sized basaltic clasts and related debris (pyroxene and plagioclase fragments), embedded in a crystallized melt. Most pyroxene grains show augite exsolution lamellae. The entire rock is extensively recrystallized, consisting of subgrains with sizes mostly <50 µm. Accessories are chromium spinel, ilmenite, and troilite.

Geochemistry: Mineral compositions and geochemistry: Mean composition of low-Ca pyroxene: Fs62.6±0.4 Wo2.5±0.3 (Fs62.1-63.3 Wo2.1-2.9); mean Fe/Mn (at.): 32; n=10. Mean composition of high-Ca pyroxene: Fs27.1±0.4 Wo42.8±0.3 (Fs26.6-27.8 Wo42.4-43.2); mean Fe/Mn (at.): 31; n=10. Mean plagioclase composition: An88±4.6 Or0.4±0.4 (An80.1-94.1 Or0.0-1.6); n=11.

Classification: Eucrite (clast-rich melt rock)

Data from:
  MB112
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2020
Mass (g):657
Pieces:1
Class:Eucrite-melt breccia
Shock stage:High
Weathering grade:Moderate
Ferrosilite (mol%):62.6±0.4; 27.1±0.4
Wollastonite (mol%):2.5±0.3; 42.8±0.3
Classifier:K. Metzler, IfP
Type spec mass (g):20
Type spec location:IfP
Main mass:John Shea, Minneapolis, USA
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 9746 approved meteorites from (Northwest Africa) (plus 1855 unapproved names)

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