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Northwest Africa 11712
Basic information Name: Northwest Africa 11712
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11712
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 500 g
Classification
  history:
Meteoritical Bulletin:  MB 107  (2018)  Howardite
Recommended:  Howardite    [explanation]

This is 1 of 421 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 27 Mar 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 11712 (NWA 11712)

(Northwest Africa)

Purchased: 2017

Classification: HED achondrite (Howardite)

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

Physical characteristics: Dark-grayish individual lacking any fusion crust.

Petrography: The meteorite is a breccia composed of abundant up to 1.3 mm mineral and less abundant basaltic clasts set into a finer grained clastic matrix. Predominant minerals are exsolved pyroxene, diogenetic orthopyroxene (30-35%) and calcic plagioclase. Accessory phases include silica, chromite, and metallic Fe. The meteorite contains abundant shock melt veins and pockets.

Geochemistry: diogenetic low-Ca pyroxene Fs33.6±0.5Wo2.3±0.2 (Fs33.2-34.6Wo2.0-2.8, n=16, FeO/MnO=25-31); low-Ca pyroxene host to augite exsolution lamellae: Fs58.6±0.7Wo4.4±0.7 (Fs57.5-59.7Wo3.2-5.7, n=10, FeO/MnO=32-35); Ca-pyroxene: Fs28.6±2.0Wo40.4±1.9 (Fs25.8-31.9Wo37.4-42.7, n=6, FeO/MnO=31-38); calcic plagioclase: An89.4±3.1 (An82.6-92.9, n=17)

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2017
Mass (g):500
Pieces:1
Class:Howardite
Shock stage:high
Weathering grade:moderate
Ferrosilite (mol%):33.6; 58.6; 28.6
Wollastonite (mol%):2.3; 4.4; 40.4
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; updated 24 Dec 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8559 approved meteorites from (Northwest Africa) (plus 1896 unapproved names)

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