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Northwest Africa 12863
Basic information Name: Northwest Africa 12863
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12863
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 410 g
Classification
  history:
Recommended:  Eucrite    [explanation]

This is 1 of 441 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 11 Oct 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12863 (NWA 12863)

(Northwest Africa)

Purchased: 2016

Classification: HED achondrite (Eucrite)

History: Catalogued in the ROM collection as LM58157

Physical characteristics: Heavily weathered fusion crust present, beige to brown in color. Cracks in the fusion crust filled in with caliche or oxides. Interior of sample is intact, but weathered as well, with caliche covering 50% of the surface. Where visible the interior of the meteorite is light grey, with some larger grey to black clasts visible.

Petrography: (K.Tait, I. Nicklin, ROM) Breccia composed of basaltic to gabbroic clasts with mineral fragments and shards of dark melt-glass set in a very finely grained comminuted matrix.  The largest clast is 4 × 3 mm.  Mineral fragments show variable shock stages ranging from undulous extinction to mild mosaicism.

Geochemistry: Mineral composition and geochemistry: Plagioclase An87.8±3.4 (n = 30). Low-Ca pyroxene composition: Fs39.5±3.4Wo9.5±4.7 (n=27). Mg#33.4-49.6 (n=27).

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2016
Mass (g):409.92
Pieces:4
Class:Eucrite
Shock stage:low
Weathering grade:high
Ferrosilite (mol%):39.5±3.4
Wollastonite (mol%):9.5±4.7
Classifier:K. Tait, ROM
Type spec mass (g):82.0
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)
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:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6968 approved meteorites from (Northwest Africa) (plus 2012 unapproved names)

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