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Northwest Africa 15218
Basic information Name: Northwest Africa 15218
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15218
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 129 g
Classification
  history:
Meteoritical Bulletin:  MB 111  (2023)  Eucrite-melt breccia
Recommended:  Eucrite-melt breccia    [explanation]

This is 1 of 104 approved meteorites classified as Eucrite-melt breccia.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 5 Sep 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 15218 (NWA 15218)

(Northwest Africa)

Purchased: 2021

Classification: HED achondrite (Eucrite, melt breccia)

History: Purchased by S. Crivello and I. Pardini in 2021 from Mirko Graul. Reportedly found in Northwest Africa.

Petrography: (K. Metzler, IfP) Clast-rich melt rock, consisting of basaltic lithic clasts (up to ~0.6 cm) with ophitic to subophitic textures and related debris (pyroxene and plagioclase fragments), embedded in a crystallized melt. The latter shows a quench texture, consisting of skeletal pyroxene and plagioclase crystals. Most pyroxene grains are unequilibrated and chemically zoned. Accessories are a silica polymorph, Cr-spinel, and ilmenite.

Geochemistry: Mineral compositions and geochemistry: Mean pyroxene composition: Fs56.7±3.8Wo8.6±4.2 (Fs51.4-62.3Wo3.4-17.5); mean Fe/Mn (at.): 31.3; n=17. Mean plagioclase composition: An90.6±0.8Or0.1±0.2 (An89.4-91.9Or0.0-0.7); n=11.

Classification: Eucrite (melt breccia), based on texture and mineral chemistry.

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Germany
Date:P 2021
Mass (g):129
Pieces:1
Class:Eucrite-melt breccia
Shock stage:high
Weathering grade:moderate
Ferrosilite (mol%):56.7±3.8
Wollastonite (mol%):8.6±4.2
Classifier:K. Metzler, IfP
Type spec mass (g):20
Type spec location:IfP
Main mass:I. Pardini and S.Crivello, Genoa, Italy
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 Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)
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Revision
  history:
  This lists important revisions made to data for this record.

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