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Northwest Africa 15258
Basic information Name: Northwest Africa 15258
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15258
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 1054 g
Classification
  history:
Meteoritical Bulletin:  MB 111  (2023)  Eucrite-br
Recommended:  Eucrite-br    [explanation]

This is 1 of 240 approved meteorites classified as Eucrite-br.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 14 Sep 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 15258 (NWA 15258)

(Northwest Africa)

Find: 2020

Classification: HED achondrite (Eucrite, brecciated)

History: Found near Algerian/Libyan border in 2020 by local meteorite hunters. Provenance: Finder-Said Yousfi-Juan A. Poblador-Robert M. Keeton.

Physical characteristics: Stone has dark-brown fusion crust with reddish weathering coating on top.

Petrography: (D. Sheikh, Cascadia) Sample is a breccia composed of mm-sized sub-angular to sub-rounded lithic clasts (primarily diabasic and gabbroic clasts, largest clast ~6 mm) and isolated mineral fragments scattered within a fine-grained matrix containing few melt vein and schlieren-bearing areas. No orthopyroxene clasts were observed. Accessory phases include ilmenite and SiO2-rich glass.

Geochemistry: Olivine (Fa90.7±1.1, range Fa89.5-92.4, Fe/Mn=45±2, n=5), Pigeonite (Fs53.1±13.9Wo16.2±6.5, range Fs34.8-80.3Wo6.1-24.6, Fe/Mn=31±4, n=40), Augite (Fs50.9±7.1Wo26.0±1.0, range Fs45.9-62.4Wo25.1-27.2, Fe/Mn=31±4, n=5), Plagioclase (An86.1±3.5, range An81.0-92.0, n=25).

Classification: HED Achondrite (Eucrite, brecciated). Some olivine and pigeonite grains are noticeably Fe-rich in composition (i.e. Fa~92.4, Fs~80.3).

Specimens: 20.6 g at Cascadia, main mass with Rob Keeton.

Data from:
  MB111
  Table 0
  Line 0:
Date:2020
Mass (g):1054
Pieces:1
Class:Eucrite-br
Shock stage:moderate
Weathering grade:moderate
Fayalite (mol%):90.7±1.1
Ferrosilite (mol%):53.1±13.9, 50.9±7.1
Wollastonite (mol%):16.2±6.5, 26.0±1.0
Classifier:D. Sheikh, Cascadia
Type spec mass (g):25.6
Type spec location:Cascadia
Main mass:Rob Keeton
Comments:CML 1527; submitted by Daniel Sheikh
Institutions
   and collections
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
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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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Carl Dietrich      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9829 approved meteorites from (Northwest Africa) (plus 1851 unapproved names)

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