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Northwest Africa 12868
Basic information Name: Northwest Africa 12868
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12868
Observed fall: No
Year found: 2013
Country: Morocco
Mass:help 536 g
Classification
  history:
Recommended:  Ureilite    [explanation]

This is 1 of 526 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 29 Feb 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 12868 (NWA 12868)

Morocco

Purchased: 2013

Classification: Ureilite

History: Purchased by D. Gregory in Tuscon, Arizona, from from Said Haddany in 2013. S. Haddany accredits the source of the material to Morocco. Type specimen is catalogued at ROM as M58158.

Physical characteristics: The sample is covered by a weakly weathered, dark fusion crust.

Petrography: The sample exhibits medium to coarse-grained cumulate texture, with major olivine approximately 60%, low-Ca pyroxene 34%, and carbon 4%. Olivine grains exhibit planar fracturing, undulatory extinction, and minor reduction rims. Low-Ca pyroxene exhibits twinning and undulatory extinction. Raman analysis confirms graphite is the carbon phase.

Geochemistry: Mineral compositions and geochemistry: Olivine cores: Fa13.8±2.5 (n=12), 0.01±0.00 wt% CaO, 0.02±0.00 wt% Cr2O3, and 0.01±0.00 wt% MnO. Pyroxene cores: Fs12.6±0.2Wo9.9±0.1 (n=10), 0.19±0.00 wt% CaO, 0.03±0.00 wt% Cr2O3, and 0.01±0.00 wt% MnO.

Classification: Achondrite (ureilite). Low shock, moderate weathering.

Specimens: The 23.84 g sample and one thin section are held at the ROM.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Tuscon Gem and Mineral Show
Date:P 2013
Mass (g):536.28
Pieces:1
Class:Ureilite
Shock stage:moderate
Weathering grade:low
Fayalite (mol%):10.6±4.2 (N=23)
Ferrosilite (mol%):12.6±0.2 (N=25)
Wollastonite (mol%):9.9±0.1 (N=25)
Classifier:S. Korchinos, UTorG
Type spec mass (g):23.84
Type spec location:ROM
Main mass:Gregory
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)
UTorG: University of Toronto, Dept. Geology, Earth Sciences Centre, 22 Russell Street Toronto, Ontario, M5S 3B1, Canada (institutional address; updated 31 Jan 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
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Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1460 approved meteorites from Morocco (plus 21 unapproved names) (plus 1 impact crater)

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