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Northwest Africa 12755
Basic information Name: Northwest Africa 12755
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12755
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 55 g
Classification
  history:
Meteoritical Bulletin:  MB 108  (2020)  Eucrite-mmict
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 258 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 26 Sep 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12755 (NWA 12755)

(Northwest Africa)

Purchased: 2019

Classification: HED achondrite (Eucrite, monomict)

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

Physical characteristics: Grayish rock partly covered with fusion crust. Saw cut shows a light-grayish interior speckled with up to 2 mm sized feldspar grains.

Petrography: The meteorite is a monomict achondritic breccia predominantly composed of low-Ca-pyroxene and calcic plagioclase. Pyroxene often contains augite exsolutions either ellipsiodale shaped or as fine lamellae. Minor phases include silica, FeS, chromite, and metallic Fe. The meteorite is highly shocked, i.e., plagioclase is partly recrystallized, and contains shock melt pockets.

Geochemistry: low-Ca pyroxene: Fs34.2±0.6Wo2.8±0.4 (Fs33.0-35.1Wo2.4-4.0, n=13, FeO/MnO=29-31); Ca-pyroxene: Fs15.1±0.2Wo42.9±0.4 (Fs14.4-15.4Wo42.3-43.7, n=12, FeO/MnO=21-27); calcic plagioclase: An93.7±0.5 (An92.8-94.7, n=17)

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2019
Mass (g):55
Pieces:1
Class:Eucrite-mmict
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):34.2; 15.1
Wollastonite (mol%):2.8; 42.9
Classifier:A. Greshake, MNB
Type spec mass (g):11.1
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; updated 24 Dec 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8390 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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