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Northwest Africa 15887
Basic information Name: Northwest Africa 15887
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15887
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 202 g
Meteoritical Bulletin:  MB 112  (2024)  Diogenite-olivine
Recommended:  Diogenite-olivine    [explanation]

This is 1 of 25 approved meteorites classified as Diogenite-olivine.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 15 Jul 2023
Writeup from MB 112:

Northwest Africa 15887 (NWA 15887)

(Northwest Africa)

Purchased: 2021

Classification: HED achondrite (Diogenite, olivine)

History: Purchased by Edwin Thompson in 2021 from a meteorite dealer in Goulmima, Morocco. Later acquired by Steve Brittenham.

Physical characteristics: Single weathered stone with no visible fusion crust.

Petrography: (D. Sheikh, Cascadia) Specimen is predominantly comprised of mm-sized blocky, tabular orthopyroxene, and minor olivine, set within a finer grained orthopyroxene-dominated matrix of similar composition. Accessory phases identified include troilite, Fe-Ni metal, and chromite.

Geochemistry: Olivine (Fa29.3±0.4, range Fa28.8-29.6, Fe/Mn=48±2 , n=4), Low-Ca Pyroxene (Fs24.7±1.8Wo1.6±0.1, range Fs21.4-27.9Wo1.4-1.8, Fe/Mn=26±1, n=18).

Classification: HED Achondrite (Diogenite-olivine bearing).

Specimens: 40.1 g at Cascadia, main mass with Steve Brittenham.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2021
Mass (g):201.9
Shock stage:moderate
Weathering grade:high
Fayalite (mol%):29.3±0.4
Ferrosilite (mol%):24.7±1.8
Wollastonite (mol%):1.6±0.1
Classifier:D. Sheikh, Cascadia
Type spec mass (g):40.1
Type spec location:Cascadia
Main mass:Steve Brittenham
Comments:CML 1537; 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)
Thompson: Edwin Thompson, 5150 Dawn St., Lake Oswego, OR 97035, United States (private address)
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 9790 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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