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Northwest Africa 15155
Basic information Name: Northwest Africa 15155
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15155
Observed fall: No
Year found: 2019
Country: Morocco
Mass:help 48.2 kg
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 263 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 23 Jul 2022
Writeup from MB 111:

Northwest Africa 15155 (NWA 15155)


Purchased: 2019

Classification: HED achondrite (Eucrite, monomict)

History: Sample was purchased in 2019 at the Denver mineral show from Said Haddany who acquired it from Morocco. Sample is catalogued at ROM as M60000.

Physical characteristics: Large grey individual with remnant fusion crust and mostly broken surfaces, all highly modified by mature desert polish. Broken surfaces show dark, angular clasts (35 vol% of stone) of up to decimetre size standing out in relief within a greyer, recessive weathering matrix.

Petrography: Cut faces reveal a breccia of angular clasts up to 5 cm size in a fine grey crystalline matrix. In polished thin section, a clastic matrix of <100 µm pyroxene and feldspar grains contains angular coarse-grained lithic clasts with ophitic to subophitic texture, consisting of cloudy exsolved pyroxene with fine exsolution lamellae, and plagioclase laths up to 2 mm length. Clast pyroxene in some cases shows weak mosaicism. Weathering is limited to local Fe oxide staining near sulfide grains.

Geochemistry: EPMA: Ca-poor pyroxene Fs54.57±2.86Wo8.49±3.29, Fe/Mn=32.0 (n=26); Ca-rich pyroxene Fs42.69±4.34Wo25.52±5.59 (n=8); feldspar An88.5±4.6 (n=31); clast feldspar An88.0±5.2 (n=19), groundmass feldspar An89.2±3.4 (n=12)

Classification: HED achondrite (Eucrite, monomict). Pyroxene and feldspar textures and elemental compositions are consistent with an equilibrated basaltic eucrite.

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

Data from:
  Table 0
  Line 0:
Place of purchase:Denver, CO, USA
Date:P 2019
Mass (g):48200
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):54.57±2.86; 42.69±4.34
Wollastonite (mol%):8.49±3.29; 25.52±5.59
Classifier:P. McCausland, ROM, UWO
Type spec mass (g):25.72
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 1871 approved meteorites from Morocco (plus 24 unapproved names) (plus 1 impact crater)

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