header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 19 Jun 2024
Search for: Search type: Search limits: Display: Publication:
Names
Text help
Places
Classes
Years
Contains
Starts with
Exact
Sounds like
NonAntarctic
Falls  Non-NWAs
What's new
  in the last:
Limit to approved meteorite names
Search text:  
Northwest Africa 15312
Basic information Name: Northwest Africa 15312
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15312
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 1021 g
Classification
  history:
Meteoritical Bulletin:  MB 111  (2023)  Lunar (melt breccia)
Recommended:  Lunar (melt breccia)    [explanation]

This is 1 of 28 approved meteorites classified as Lunar (melt breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 12 Nov 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 15312 (NWA 15312)

(Northwest Africa)

Find: Dec 2021

Classification: Lunar meteorite (melt breccia)

History: Edwin Thompson gave a 32.6 g slice to Cascadia for classification with the following information: He purchased the meteorite from a broker in Mauritania, who said that it was found in December 2021 near Agouémit, Mauritania; no geographic coordinates were obtained. The main mass has since been transferred to Paul Stahura.

Petrography: (M. Hutson, A. Ruzicka, Cascadia): In thin section, the sample is comprised of clasts ranging from single grain fragments <10 μm across to rock fragments up to 4 mm in length. Melt zones between clasts are dominantly feldspathic and cryptocrystalline, although an elongate stringer of brown glassy material (~3.5 × 0.7 mm) abuts one of the larger clasts. Fractures filled with a combination of feldspar and calcite cut across the section.

Geochemistry: Individual grains across the entire section were analyzed, along with two of the larger clasts. Excluding the larger clasts, olivine: Fa28.4±5.2, Fe/Mn = 86.7±6.6, N=31; low-Ca pyroxene: Fs21.0±5.0Wo3.7±0.7, Fe/Mn = 50.1±4.6, N=27; pigeonite: Fs30.5±6.0Wo8.3±3.0, N=9; high-Ca pyroxene: Fs15.1±5.1Wo36.2±9.5, N=15; plagioclase feldspar: Ab4.1±1.8Or0.5±0.1An95.4±1.8, N=17. Clast 4 (~2.2 × 1.7 mm) consists of roughly 60% feldspar (Ab19.4±7.6Or1.0±0.3An80.1±8.0, N=11), 35% pigeonite (Fs24.2±2.6Wo11.5±7.4, N=2) and high-Ca pyroxene (Fs17.4±0.6Wo31.5±2.7, N=2), and 5% olivine (Fa32.5±0.7, N=6). Clast 5 (~2.5 × 1.4 mm) consists of about 50% feldspar (Ab7.7±1.7Or0.6±0.3An91.7±1.9, N=5), 30% olivine (Fa22.3±0.6, N=4), and 20% low-Ca pyroxene (Fs18.8±0.4Wo2.8±0.4, N=4) and high-Ca pyroxene (Fs8.6±0.5Wo43.5±0.8, N=3).

Classification: This meteorite is best described as a lunar feldspathic clast-rich melt breccia base on texture and chemistry.

Specimens: Cascadia holds 26.8 g in one piece, as well as a polished thin section and material in an epoxy butt; Paul Stahura holds the main mass.

Data from:
  MB111
  Table 0
  Line 0:
Date:Dec 2021
Mass (g):1021
Pieces:1
Class:Lunar (melt breccia)
Fayalite (mol%):28.4±5.2 (N=31)
Ferrosilite (mol%):21.0±5.0 (N=27)
Wollastonite (mol%):3.7±0.7 (N=27)
Classifier:M. Hutson, A. Ruzicka and D. Sheikh, Cascadia
Type spec mass (g):32.6
Type spec location:Cascadia
Main mass:Paul Stahura
Comments:Lab number CML 1518; submitted by Melinda Hutson
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)
Thompson: Edwin Thompson, 5150 Dawn St., Lake Oswego, OR 97035, United States (private address)
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. ?
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Melinda Hutson   
Geography: 
Coordinates:Unknown.

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

Direct link to this page