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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:
Recommended:  Eucrite-br    [explanation]

This is 1 of 213 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 Meteoritical Bulletin, no. 111, in preparation (2022)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8636 approved meteorites from (Northwest Africa) (plus 1884 unapproved names)

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