header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 18 Sep 2021
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:
Include past classifications in search
Limit to approved meteorite names
Search text:  
Northwest Africa 12940
Basic information Name: Northwest Africa 12940
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12940
Observed fall: No
Year found: 2012
Country: Morocco
Mass:help 2.12 g
Classification
  history:
Recommended:  Eucrite    [explanation]

This is 1 of 513 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 2 May 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 12940 (NWA 12940)

Morocco

Purchased: 2012

Classification: HED achondrite (Eucrite)

History: Purchased from A. Aaronson in 2012 at the Tucson Gem and Mineral Show, who provided origin of sample as being from Morocco. Catalogued in the Royal Ontario Museum as sample LM58201

Physical characteristics: The meteorite has a well-preserved, black fusion crust with little signs of weathering. Cracks in the fusion crust are not filled with caliche. Interior of the sample fresh light grey, intact, uniform with no obvious signs of shock or weathering.

Petrography: Monomict breccia of basaltic clasts. Most pyroxene grains show mosaicism.

Geochemistry: Mineral composition and geochemistry: Plagioclase An90.21±1.24 (n=23). Pyroxene composition: Fs40.68±13.81Wo1.35±0.42 and Mg#54.06 (n=29).

Classification: (K. Tait, ROM). Texture and composition suggest the sample is a monomict breccia.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Tucson Gem and Mineral Show
Date:P 2012
Mass (g):2.12
Pieces:1
Class:Eucrite
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):40.68±13.81
Wollastonite (mol%):1.35±0.42
Classifier:K. Tait, I. Nicklin, ROM
Type spec mass (g):0.42
Type spec location:ROM
Main mass:Dr. Brendt Hyde,
Comments:Submitted by V. Di Cecco, ROM
Institutions
   and collections		 ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1670 approved meteorites from Morocco (plus 23 unapproved names) (plus 1 impact crater)

Direct link to this page