header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 26 Mar 2024
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:
Limit to approved meteorite names
Search text:
 
Northwest Africa 14712
Basic information Name: Northwest Africa 14712
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14712
Observed fall: No
Year found: 2012
Country: Morocco
Mass:help 6.32 kg
Classification
  history:
Meteoritical Bulletin:  MB 111  (2023)  LL4-6
Recommended:  LL4-6    [explanation]

This is 1 of 83 approved meteorites classified as LL4-6.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 21 Feb 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 14712 (NWA 14712)

Morocco

Purchased: 2012

Classification: Ordinary chondrite (LL4-6)

History: Sample was purchased at the Tucson mineral show in 2012 from A. Aaronson, who acquired it from Morocco. Sample is catalogued at ROM as M59929.

Physical characteristics: Large, fresh regmalypted individual with light development of desert polish. Most surfaces have dark fusion crust. Broken surfaces reveal a green-grey interior bearing dark subangular breccia clasts up to several cm in size. Matrix contains sparse, disseminated metal grains. Physical properties: Magnetic susceptibilty of a fusion crust-free 15.77 g specimen is log χ (× 10-9 m3/kg) = 3.73.

Petrography: Cut faces show a breccia of dark and light colored subangular clasts in a fragmental matrix bearing sparse disseminated metal grains and metal aggregates. Light clasts range from showing only some delineated chondrules to showing well-delineated chondrules in a darker matrix. Dark clasts lack metal and appear featureless. In polished thin section, the stone is a fragmental chondritic breccia, consisting of high petrographic grade subangular chondrite lithic fragments from cm size to 10s of µm, set in a groundmass of fragmental chondritic debris with few intact chondrules. All clasts have a 20 µm dark brown rim. Olivine and pyroxene in clasts and in groundmass exhibit undulatory to mosaic extinction. Dark clasts appear to be shock-darkened. Fe oxidation is minor and limited to local alteration haloes around metal grains.

Geochemistry: EPMA: olivine Fa30.35±0.65 (n=30); Ca-poor pyroxene Fs24.62±0.78, Wo1.91±0.28 (n=20); Ca-rich pyroxene Fs10.88±0.11, Wo43.92±0.72 (n=10)

Classification: Ordinary chondrite LL4-6 breccia (S4) W1. Low observed metal content, EPMA olivine and pyroxene mineral compositions and magnetic susceptibility of log χ (× 10-9 m3/kg) = 3.73 are all consistent with LL chondrite. Clasts appear to be of LL chondrite material ranging from 4 to 6 grades, with some shock-darkened.

Specimens: Type specimen ROM; main mass DGregory

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Tucson, USA
Date:P 2012
Mass (g):6324.22
Pieces:1
Class:LL4-6
Shock stage:S4
Weathering grade:W1
Fayalite (mol%):30.35±0.65
Ferrosilite (mol%):24.62±0.78; 10.88±0.11
Wollastonite (mol%):1.91±0.28; 43.92±0.72
Magnetic suscept.:3.73
Classifier:P. McCausland (ROM, UWO), V DiCecco (ROM)
Type spec mass (g):25.77
Type spec location:ROM
Main mass:Dgregory
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)
UWO: University of Western Ontario, Department of Earth Sciences, BGS 1026, 1151 Richmond St. N, London, Ontario, Canada N6A 5B7, Canada (institutional address; updated 18 Jul 2015)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
DGregory: David Gregory, 230 First Avenue, Suite 108, St. Thomas, Ontario N5R 4P5, Canada (private address)
Catalogs:
References: Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 2068 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater)
Also see:
  This lists the most popular meteorites among people who looked up this meteorite.
Revision
  history:
  This lists important revisions made to data for this record.

Direct link to this page