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Northwest Africa 15646
Basic information Name: Northwest Africa 15646
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15646
Observed fall: No
Year found: 2020
Country: Morocco
Mass:help 5.81 kg
Meteoritical Bulletin:  MB 112  (2024)  Eucrite-unbr
Recommended:  Eucrite-unbr    [explanation]

This is 1 of 140 approved meteorites classified as Eucrite-unbr.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 21 Aug 2023
Writeup from MB 112:

Northwest Africa 15646 (NWA 15646)


Purchased: 2020 Feb

Classification: HED achondrite (Eucrite, unbrecciated)

History: Purchased in February 2020 by John Humphries from Mostafa Hnini in Tucson, AZ

Physical characteristics: A single stone partially covered with black fusion crust. Interior shows unbrecciated texture with millimeter-sized dark green pyroxenes and white plagioclase crystals. Interior shows a mostly granular basaltic texture. Several thin black glassy shock veins transect fragments in the inspected hand samples.

Petrography: (D. Dickens, CCMS) Examination of a polished microprobe mount and BSE images show this meteorite is composed of approximately equal amounts pyroxene and plagioclase. Plagioclase and pyroxene grains observed in poikiloblastic arrangement. Most pyroxenes show exsolution. Accessory phases of silica, ilmenite, and troilite. No metal was found.

Geochemistry: (D. Dickens, CCMS, and A. S. Bell, CUB) low-Ca pyroxene Fs60.6±0.7Wo2.1±0.5, Fe/Mn=32±1, n=7; Ca-pyroxene Fs27.3±2.4Wo41.2±4.4, Fe/Mn=31±1, n=3; plagioclase An90.3±1.2Ab9.4±1.1Or0.4±0.1, n=10.

Classification: Eucrite (unbrecciated)

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

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson, AZ
Date:P 2020 Feb
Mass (g):5805
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):60.6±0.7, 27.3±2.4
Wollastonite (mol%):2.1±0.5, 41.2±4.4
Classifier:D. Dickens, CCMS
Type spec mass (g):22.5g
Type spec location:Cascadia
Main mass:John Humphries
Comments:Field name JH04; 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 2118 approved meteorites from Morocco (plus 32 unapproved names) (plus 1 impact crater)

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