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Northwest Africa 15933
Basic information Name: Northwest Africa 15933
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15933
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 472 g
Recommended:  Eucrite-melt breccia    [explanation]

This is 1 of 97 approved meteorites classified as Eucrite-melt breccia.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 10 Jun 2023
Writeup from MB 112:

Northwest Africa 15933 (NWA 15933)

(Northwest Africa)

Purchased: March 2018

Classification: HED achondrite (Eucrite, melt breccia)

History: Purchased by Jasper Spencer from a meteorite dealer in Morroco in March 2018.

Physical characteristics: Single stone with dark brown fusion crust.

Petrography: (D. Sheikh, Cascadia) Sample is comprised of sub-angular to sub-rounded, mm-sized basaltic clasts set within an opaque, melt rock matrix containing sparse vesicles. Accessory phases include SiO2-rich glass, troilite, Ti-bearing chromite, and ilmenite.

Geochemistry: Low-Ca Pyroxene (Fs59.8±1.6Wo3.1±1.2, range Fs56.3-62.5Wo1.6-5.5, Fe/Mn=29±3, n=29), Pigeonite (Fs56.1±2.0Wo8.4±2.7, range Fs52.8-57.8Wo6.0-12.8, Fe/Mn=31±4, n=5), High-Ca Pyroxene (Fs28.0±0.8Wo41.1±1.4, range Fs26.9-29.1Wo39.5-42.8, Fe/Mn=30±5, n=8), Calcic Plagioclase (An91.0±1.7, range An86.1-93.1, n=22).

Classification: HED Achondrite (Eucrite-melt breccia).

Specimens: 23.2 g at Cascadia, main mass with Emanuela Vanacore.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P March 2018
Mass (g):472
Class:Eucrite-melt breccia
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):59.8±1.6, 56.1±2.0, 28.0±0.8
Wollastonite (mol%):3.1±1.2, 8.4±2.7, 41.1±1.4
Classifier:D. Sheikh, Cascadia
Type spec mass (g):23.2
Type spec location:Cascadia
Main mass:Emanuela Vanacore
Comments:CML 1551, Jasper sample C; submitted by Daniel Sheikh
   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)
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
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     This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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