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Northwest Africa 15612
Basic information Name: Northwest Africa 15612
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15612
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 90 g
Classification
  history:
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 312 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 23 Feb 2023
Writeuphelp
Writeup from MB 112:

Northwest Africa 15612 (NWA 15612)

(Northwest Africa)

Purchased: May 2022

Classification: Lunar meteorite (feldspathic breccia)

History: The meteorite was purchased from a group of meteorites hunters in Nouadhibou, Mauritania, in May, 2022.

Physical characteristics: Six dark grayish fragments without fusion crust.

Petrography: The meteorite is a fine-grained breccia composed of up to 3 mm sized mineral fragments of anorthite, olivine with disitnct chemical compositions, low-Ca-pyroxene, and augite plus some melt fragments set in a very fine-grained feldspathic matrix. Minor phases include ilmenite, chromite, troilite, and FeNi metal.

Geochemistry: olivine: Fa21.4±0.5 (Fa20.6-22.2, FeO/MnO=83±9, n=7); magnesian olivine: Fa14.0±0.8 (Fa12.5-15.2, FeO/MnO=82±9, n=7); zoned olivine: Fa11.8±3.3 (Fa6.6-16.8, FeO/MnO=76±8, n=7); low-Ca pyroxene: Fs11.8±0.1Wo2.9±0.1 (Fs11.8-12.0Wo2.8-3.0, FeO/MnO=45±3, n=7); Ca-pyroxene: Fs9.9±0.9Wo29.3±2.5 (Fs9.0-11.7Wo34.8-41.8, FeO/MnO=41±8, n=7); calcic plagioclase: An96.7±0.3 (An96.3-97.3, n=7)

Data from:
  MB112
  Table 0
  Line 0:
Place of purchase:Nouadhibou, Mauritania
Date:P May 2022
Mass (g):90
Pieces:6
Class:Lunar (feldsp. breccia)
Shock stage:high
Weathering grade:low
Fayalite (mol%):21.4; 14.0; 11.8
Ferrosilite (mol%):11.8; 9.9
Wollastonite (mol%):2.9; 29.3
Classifier:A. Greshake, MNB
Type spec mass (g):18
Type spec location:MNB
Main mass:Salamu Ali
Comments:Submitted by Ansgar Greshake
Institutions
   and collections		 MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
Find references in NASA ADS:
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Photos:
CreditPhotos
Public domain photographs:
Ansgar Greshake   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9042 approved meteorites from (Northwest Africa) (plus 1870 unapproved names)

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