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Northwest Africa 15301
Basic information Name: Northwest Africa 15301
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15301
Observed fall: No
Year found: 2011
Country: Morocco
Mass:help 4.49 kg
Recommended:  H4    [explanation]

This is 1 of 6388 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 1 Oct 2022
Writeup from MB 111:

Northwest Africa 15301 (NWA 15301)


Purchased: 2011

Classification: Ordinary chondrite (H4)

History: Sample was purchased in 2011 at the Tucson mineral show from AAaronson who acquired it from Morocco. Sample is catalogued at ROM as M60307.

Physical characteristics: Incomplete fusion crust showing regmaglypts. Broken surfaces have visible chondrules. All surfaces show mature desert polish.

Petrography: Cut faces show abundant metal in a rusty brown chondritic matrix. In polished thin section, chondrules of types POP, PO, RP, CC and BO are well-defined in a dark matrix, and have average diameter 463±210 µm (n=45). Chondrule mesostasis is amorphous to finely recrystallized. Olivine and pyroxene grains typically show sharp extinction. Metal grains are surrounded by Fe oxides. In BSE images, Ca-poor pyroxene shows subtle compositional zoning.

Geochemistry: EPMA: Olivine: Fa17.50±0.51 (n=29); Ca-poor pyroxene: Fs14.36±3.22 Wo1.26±0.90 (n=22); Ca-rich pyroxene: Fs6.05±0.76Wo41.36±5.25 (n=11). Magnetic susceptibility measured on a 27.18 g endpiece is log χ (× 10-9 m3/kg) = 4.89.

Classification: Ordinary chondrite: H4 (S1) W3. Chondrule measured size and definition is consistent with an H chondrite. EPMA olivine and pyroxene compositions and compositional variation indicate H4 chondrite. Bulk magnetic susceptibility is consistent with a weathered H chondrite.

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

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson, AZ, USA
Date:P 2011
Mass (g):4489
Shock stage:S1
Weathering grade:W3
Fayalite (mol%):17.50±0.51
Ferrosilite (mol%):14.36±3.22; 6.05±0.76
Wollastonite (mol%):1.26±0.90; 41.36±5.25
Magnetic suscept.:4.89
Classifier:P. McCausland, ROM, UWO; V. Di Cecco, ROM
Type spec mass (g):27.18
Type spec location:ROM
Main mass:DGregory
Comments: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)
DGregory: David Gregory, 230 First Avenue, Suite 108, St. Thomas, Ontario N5R 4P5, Canada (private address)
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
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     This is 1 of 1903 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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