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Northwest Africa 14554
Basic information Name: Northwest Africa 14554
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14554
Observed fall: No
Year found: 2012
Country: Morocco
Mass:help 25.2 g
Recommended:  H4    [explanation]

This is 1 of 6459 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 22 Dec 2021
Writeup from MB 110:

Northwest Africa 14554 (NWA 14554)


Purchased: 2012

Classification: Ordinary chondrite (H4)

History: Sample was purchased in 2012 from Adam Aaronson at the Tucson mineral show who acquired it from Morocco. Sample is catalogued at the Royal Ontario Museum as M58501.

Physical characteristics: Individual mostly covered by fusion crust with minor broken surfaces and moderately-developed desert polish.

Petrography: Cut surfaces show a dark grey matrix containing somewhat flattened chondrules that define a foliation fabric in the rock. Metal and sulfide blebs of typically 0.4 mm size are disseminated throughout, also defining the foliation. Some metal occurs in short veins. The matrix appears to be shock blackened. In thin section, ovoid chondrules ranging in size up to 1.4 mm length, chondrule fragments and individual olivine and pyroxene grains are set in a dark matrix. Chondules are are well-distinguishable and chondrules and fragments typically have a dark fine-grained rim. Olivine and pyroxene in chondrules and matrix exhibits undulatory to mosaic extinction and has planar fractures. Metal occurs as elongate irregular blebs length displaying embayment texture with the silicates. Accessory sulfides typically have a spongy appearance and are associated with Fe-oxides.

Geochemistry: EPMA: Olivine Fa19.05±0.50 (n=28); Ca-poor pyroxene Fs16.59±0.27Wo1.26±0.07 (n=21); Ca-rich pyroxene Wo45.92±0.38Fs6.32±0.61 (n=7).

Classification: Ordinary chondrite: H4 (S4) W2

Specimens: Type specimen location: ROM. Main mass: D. Gregory.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson, AZ, USA
Date:P 2012
Mass (g):25.20
Shock stage:S4
Weathering grade:W2
Fayalite (mol%):19.05±0.50
Ferrosilite (mol%):16.59±0.27
Wollastonite (mol%):1.26±0.07
Classifier:P. McCausland, ROM, UWO
Type spec mass (g):8.02
Type spec location:ROM
Main mass:Dgregory
Comments:M58501; submitted by V. Di Cecco, ROM
   and collections
ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011)
UWO: University of Western Ontario, Department of Earth Sciences, BGS 1026, 1151 Richmond St. N, London, Ontario, Canada N6A 5B7, Canada (institutional address; updated 18 Jul 2015)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
DGregory: David Gregory, 230 First Avenue, Suite 108, St. Thomas, Ontario N5R 4P5, Canada (private address)
References: Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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     This is 1 of 2012 approved meteorites from Morocco (plus 35 unapproved names) (plus 1 impact crater)

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