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Northwest Africa 12890
Basic information Name: Northwest Africa 12890
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12890
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 1980 g
Classification
  history:
Recommended:  H4    [explanation]

This is 1 of 5782 approved meteorites (plus 2 unapproved names) classified as H4.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 7 Sep 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12890 (NWA 12890)

(Northwest Africa)

Purchased: 2005

Classification: Ordinary chondrite (H4)

History: Purchased by an anonymous collector from a dealer at the Munich Show in 2005, subsequently acquired by PSF, then sold in 2019 to the Harkness Collection.

Petrography: (A. Irving, UWS and J. Boesenberg, BrownU; T. Bunch and J. Wittke, NAU) Well-formed, relatively small chondrules are set in a relatively coarse grained matrix containing abundant altered metal.

Geochemistry: Olivine (Fa18.6±0.7 (range Fa18.1-19.5, N = 4), low-Ca pyroxene (Fs16.5±0.2Wo0.5±0.3 (range Fs16.2-16.6Wo0.7-0.2, N = 3).

Classification: Ordinary chondrite (H4).

Specimens: 47.02 g including one polished thin section at PSF; remainder in Harkness Collection.

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Munich
Date:P 2005
Mass (g):1980
Pieces:1
Class:H4
Shock stage:S2
Weathering grade:W2/3
Fayalite (mol%):18.6±0.7
Ferrosilite (mol%):16.5±0.2
Wollastonite (mol%):0.5±0.3
Classifier:A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):47.02
Type spec location:PSF
Main mass:Harkness Collection
Comments:Work name HC4; submitted by A. Irving
Institutions
   and collections
NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
BrownU: Brown University Providence, RI 02912, United States (institutional address; updated 7 Sep 2019)
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 7035 approved meteorites from (Northwest Africa) (plus 2000 unapproved names)

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