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Northwest Africa 12635
Basic information Name: Northwest Africa 12635
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12635
Observed fall: No
Year found: 2013
Country: Morocco
Mass:help 64.2 g
Classification
  history:
Recommended:  Ureilite    [explanation]

This is 1 of 516 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 11 Jun 2019
Revised 27 Jul 2019: Updated O isotopes
Writeuphelp
Writeup from MB 108:

Northwest Africa 12635 (NWA 12635)

Morocco

Purchased: 2013 Feb

Classification: Ureilite

History: Registered at the Royal Ontario Museum as LM58155

Petrography: (A. Cernok) Predominantly shock-fractured olivine with significant reduction rims. Low-Ca pyroxene fractured. Graphite and diamond occur in clots interstitial to the mineral grains, graphite also along grain boundaries. Modal abundances: olivine approx. 80%; 20% low-Ca pyroxene grains; 5% grain-boundary related graphite and diamond.

Geochemistry: Olivine: Fa6.7±0.3 (n=21); Pigeonite: Fs5.7±0.1Wo6.4±0.3 (n=19). Oxygen Isotopes (K. Ziegler, UNM): δ17O = 0.362, 0.525, 0.348 permil, δ18O = 5.324, 5.588, 5.302 permil, Δ17O = -2.449, -2.426, -2.451 permil (n=3).

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Tucson Gem and Mineral Show
Date:P 2013 Feb
Mass (g):64.22
Pieces:3
Class:Ureilite
Shock stage:moderate
Weathering grade:low
Fayalite (mol%):6.7 ± 0.3
Ferrosilite (mol%):5.7 ± 0.1
Wollastonite (mol%):6.4 ± 0.3
Classifier:A. Cernok, ROM
Type spec mass (g):13.00
Type spec location:ROM
Main mass:Gregory
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)
Gregory: David Gregory, 230 First Avenue, Suite 108, St. Thomas, Ontario N5R 4P5, Canada (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
Find references in NASA ADS:
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Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1417 approved meteorites from Morocco (plus 15 unapproved names) (plus 1 impact crater)

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