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Northwest Africa 12830
Basic information Name: Northwest Africa 12830
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12830
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 232 g
Classification
  history:
Recommended:  Lunar    [explanation]

This is 1 of 86 approved meteorites classified as Lunar.   [show all]
Search for other: Lunar meteorites
Comments: Approved 26 Sep 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12830 (NWA 12830)

(Northwest Africa)

Purchased: 2019

Classification: Lunar meteorite

History: The meteorite was purchased from a local meteorite dealer in Morocco.

Physical characteristics: Greyish rock partly covered with fusion crust.

Petrography: The meteorite is a recrystallized melt breccia displaying a poikilitic texture of olivine, pigeonite, and augite up to 50 μm in size enclosing calcic plagioclase. Some plagioclase grains exhibit mechanical twinning, show strongly undulating extinction, and contain planar deformation features. Maskelynite has not been observed. Minor phases include silica, FeS and FeNi-metal. The meteorite is fractured and contains abundant shock melt veins and pockets.

Geochemistry: olivine: Fa31.8±1.6 (Fa30.3-34.0, FeO/MnO=100±5, n=11); pigeonite: Fs28.6±0.4Wo7.6±0.5 (Fs28.2-29.1Wo7.1-8.5, FeO/MnO=58±2, n=10); Ca-pyroxene: Fs17.9±0.9Wo36.8±1.4 (Fs16.7-19.6Wo35.1-39.0, FeO/MnO=46±6, n=11); calcic plagioclase: An95.4±1.3 (An92.9-97.1, n=11)

Classification: Lunar (anorthositic melt breccia)

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2019
Mass (g):232
Pieces:1
Class:Lunar
Shock stage:moderate
Weathering grade:low
Fayalite (mol%):31.8
Ferrosilite (mol%):28.6; 17.9
Wollastonite (mol%):7.6; 36.8
Classifier:A. Greshake, MNB
Type spec mass (g):20
Type spec location:MNB
Main mass:Philippe Schmitt-Kopplin
Comments:Submitted by Ansgar Greshake
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstrasse 43, D-10115 Berlin, Germany (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
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Photos:
CreditPhotos
Public domain photographs:
Ansgar Greshake         
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6968 approved meteorites from (Northwest Africa) (plus 2012 unapproved names)

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