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Northwest Africa 12421
Basic information Name: Northwest Africa 12421
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12421
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 99.5 g
Classification
  history:
Recommended:  H3    [explanation]

This is 1 of 584 approved meteorites (plus 1 unapproved name) classified as H3.   [show all]
Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 18 Jan 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12421 (NWA 12421)

(Northwest Africa)

Purchased: 2005

Classification: Ordinary chondrite (H3)

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

Petrography: (A. Irving and S. Kuehner, UWS) Well-formed chondrules (apparent diameter 560±340 µm, N = 21) occcur within a matrix containing relatively abundant altered metal and chlorapatite.

Geochemistry: Olivine (Fa0.6-36.6, Cr2O3 in ferroan examples 0.02-0.12 wt.%, mean 0.06±0.04 wt.%, N = 6), orthopyroxene (Fs3.3-21.0Wo0.4-1.8, N = 3), subcalcic augite (Fs21.6Wo25.4), augite (Fs8.8Wo41.6).

Classification: Ordinary chondrite (H3).

Specimens: The entire specimen including one polished thin section is at PSF.

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Munich
Date:P 2005
Mass (g):99.45
Pieces:1
Class:H3
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):0.6-36.6
Ferrosilite (mol%):3.3-21.0
Wollastonite (mol%):0.4-1.8
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):99.45
Type spec location:PSF
Main mass:PSF
Comments:Work name CHC18032; submitted by A. Irving
Institutions
   and collections
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)
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 6711 approved meteorites from (Northwest Africa) (plus 2022 unapproved names)

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