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Northwest Africa 12236
Basic information Name: Northwest Africa 12236
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12236
Observed fall: No
Year found: 2018
Country: Morocco
Mass:help 21 g
Classification
  history:
Meteoritical Bulletin:  MB 107  (2018)  H7
Recommended:  H7    [explanation]

This is 1 of 31 approved meteorites classified as H7.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 14 Nov 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 12236 (NWA 12236)

Morocco

Purchased: 2018 Jan

Classification: Ordinary chondrite (H7)

History: Specimen is cataloged at the Royal Ontario Museum as LM58922.

Petrography: Specimen is composed of olivine, pyroxene and minor plagioclase and is devoid of chondrules or relict chondrule rims. Texture is mainly poikilitic, with large olivine oikocrysts (averaging 2383 µm in diameter, n=12) enclosing small olivine phenocrysts (averaging 104 µm in diameter, n=26).

Geochemistry: Olivine: 17.9±1.4, Fe/Mn=35.9±5.5 (n=27); Low Ca-pyroxene: Fs15.0±0.7Wo2.1±1.1, Fe/Mn=23.3±5.0 (n=24); Augite Fs6.6±1.0Wo42.0±3.6, Fe/Mn=15.9±1.5, Cr2O3=1.22±0.23 wt% (n=7). Oxygen Isotopes: (Karen Ziegler, UNM) δ17O = 2.937 permil, δ18O = 4.497 permil, δ17O = 0.562 permil

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Tucson Gem and Mineral Show
Date:P 2018 Jan
Mass (g):21.03
Pieces:1
Class:H7
Shock stage:S1
Weathering grade:W1
Fayalite (mol%):17.9±1.4 (n=27)
Ferrosilite (mol%):15.0±0.7 (n=24); 6.6±1.0 (n=7)
Wollastonite (mol%):2.1±1.1 (n=24); 42.0±3.6 (n=7)
Classifier:V. Di Cecco, ROM
Type spec mass (g):5.02
Type spec location:ROM
Main mass:DGregory
Comments:Submitted by V. Di Cecco, ROM
Plots: O isotopes:  
Institutions
   and collections		 ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011)
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
DGregory: David Gregory, 230 First Avenue, Suite 108, St. Thomas, Ontario N5R 4P5, Canada (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1992 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater)

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