MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 18 Nov 2023
Search for: Search type: Search limits: Display: Publication:
Text help
Starts with
Sounds like
Falls  Non-NWAs
What's new
  in the last:
Limit to approved meteorite names
Search text:  
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
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 275 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)
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
Find references in NASA ADS:
Find references in Google Scholar:


     This is 1 of 2012 approved meteorites from Morocco (plus 35 unapproved names) (plus 1 impact crater)

Direct link to this page