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Northwest Africa 15645
Basic information Name: Northwest Africa 15645
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15645
Observed fall: No
Year found: 2021
Country: Morocco
Mass:help 528 g
Meteoritical Bulletin:  MB 112  (2024)  Eucrite-mmict
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 287 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 21 Aug 2023
Writeup from MB 112:

Northwest Africa 15645 (NWA 15645)


Purchased: 2021 Sept

Classification: HED achondrite (Eucrite, monomict)

History: Purchased September 2021 by John Humphries in Denver from a local dealer.

Physical characteristics: Several identical looking dark sand-polished stones. Interior saw cut reveals a shocked-darkened breccia with several contrasting lighter less shocked areas.

Petrography: (D. Dickens, CCMS) Examination of polished microprobe mount and BSE images show this meteorite is a breccia of approximately equal amounts pyroxene (50.1%) and plagioclase (48.3%), with ilmenite and other opaques comprising the remainder. Clasts are subhedral set in a fine-grained silicate matrix of the same composition. Most plagioclase and pyroxene grains were observed in poikiloblastic arrangement. Many pyroxene grains have fine exsolution lamella. No metal was found.

Geochemistry: (D. Dickens, CCMS, and A. S. Bell, CUB) pigeonite Fs55.2±2.9Wo12.1±3.8, Fe/Mn=34±2, n=9; augite Fs44.8±6.1Wo25.4±7.8, Fe/Mn=32±1, n=2; plagioclase An91.7±1.5Ab7.9±1.4Or0.3±0.1, n=10.

Classification: Eucrite (monomict breccia).

Specimens: Type specimen location Cascadia; Main mass with John Humphries

Data from:
  Table 0
  Line 0:
Place of purchase:Denver, CO
Date:P 2021 Sept
Mass (g):528
Shock stage:high
Weathering grade:moderate
Ferrosilite (mol%):55.2±2.9, 44.8±6.1
Wollastonite (mol%):12.1±3.8, 25.4±7.8
Classifier:D. Dickens, CCMS
Type spec mass (g):21.2g
Type spec location:Cascadia
Main mass:John Humphries
Comments:Field name JH03; submitted by D. Dickens
   and collections
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
CUB: Daniel Ozdín, Mineralogical Museum of Comenius University, Faculty of Natural Sciences, Ilkovicova 6, 842 15 Bratislava, Slovakia (institutional address; updated 2 Dec 2018)
CCMS: Colorado Center for Meteoritic Studies 6200 Becker LN Loveland, CO 80538, United States (private address; updated 22 Jan 2024)
References: Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Cartier C., Consolmagno G., Goodrich C., Greshake A., Gross J., Joy K. H., Miao B. and Zhang B. (2024) The Meteoritical Bulletin, no. 112. Meteoritics & Planetary Science 59, 1820–1823. ?
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     This is 1 of 2093 approved meteorites from Morocco (plus 32 unapproved names) (plus 1 impact crater)

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