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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
Classification
  history:
Recommended:  Diogenite-olivine    [explanation]

This is 1 of 21 approved meteorites classified as Diogenite-olivine.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 15 Jul 2023
Writeuphelp
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:
  MB112
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2021
Mass (g):201.9
Pieces:1
Class:Diogenite-olivine
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
Institutions
   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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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