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Northwest Africa 12347
Basic information Name: Northwest Africa 12347
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12347
Observed fall: No
Year found: 2017
Country: Morocco
Mass:help 1243 g
Classification
  history:
Meteoritical Bulletin:  MB 107  (2018)  H5
Recommended:  H5    [explanation]

This is 1 of 10605 approved meteorites (plus 18 unapproved names) classified as H5.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 27 Nov 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 12347 (NWA 12347)

Morocco

Purchased: 2017 Feb

Classification: Ordinary chondrite (H5)

Physical characteristics: A dark-brown fusion crust covers the outer edges of the hand sample. The sample appears to be at least moderately weathered due to an overall dark brown appearance and the absence of abundant visible metal grains. The largest chondrule visible in the type specimen has a diameter of 3.5 mm.

Petrography: (J. Laughton, UWO) Model abundances were determined using a combination of optical microscopy and ImageJ software: 74% chondrules, 12% matrix, 6% oxide, 5% metal, and 3% sulphide [+ trace amount of calcium phosphate]. The silicates present include: olivine, orthopyroxene, minor clinopyroxene and plagioclase, and metal (~5%). The sulfide present was in the form of troilite with <0.5 wt.% Ni content. Chondrule diameters ranged in size from 3.5 to 0.1 mm, with an average diameter of 0.4 mm (n = 50). Majority of the chondrules could be discerned, but not all had sharp boundaries. Very minor undulatory extinction patterns were observed in olivine and pyroxene crystals, as well as some minor irregular fractures within the crystals. In thin section ~70% of the metal and troilite has been replaced by a dark red iron oxide (hematite). Oxidation of silicates has also started along the cracks of some crystals.

Geochemistry: (EMPA, M. Beauchamp, UWO) Olivine (Fa16.7±0.2; Fe/Mn = 29.2±1.0; n=10), Orthopyroxene (Fs14.6±0.2Wo1.7±0.0 ; Fe/Mn = 17.8±0.6; n=11) and Plagioclase An8.8±0.4 (n=10).

Classification: Oridinary chondrite H5, S2, W3.

Specimens: 54.0 g including a thin section at UWO. S. Tutorow holds the main mass.

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Erfoud, Morocco
Date:P 2017 Feb
Mass (g):1242.9
Pieces:1
Class:H5
Shock stage:S2
Weathering grade:W3
Fayalite (mol%):16.7±0.2 (N=10)
Ferrosilite (mol%):14.6±0.2 (N=11)
Wollastonite (mol%):1.7±0.0 (N=11)
Classifier:J. Laughton, UWO
Type spec mass (g):54.0
Type spec location:UWO
Main mass:S. Tutorow
Comments:G704; submitted by A. Bouvier, UWO
Institutions
   and collections
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Ryan Upchurch   
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1706 approved meteorites from Morocco (plus 26 unapproved names) (plus 1 impact crater)

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