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Northwest Africa 15855
Basic information Name: Northwest Africa 15855
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15855
Observed fall: No
Year found: 2020
Country: Western Sahara
Mass:help 1788 g
Classification
  history:
Meteoritical Bulletin:  MB 112  (2024)  CV3
Recommended:  CV3    [explanation]

This is 1 of 473 approved meteorites (plus 2 unapproved names) classified as CV3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CV chondrites, and CV-CK clan chondrites
Comments: Approved 11 Apr 2023
Writeuphelp
Writeup from MB 112:

Northwest Africa 15855 (NWA 15855)

Oued Ed-Dahab, Western Sahara

Find: 2020

Classification: Carbonaceous chondrite (CV3)

History: Eight pieces were found by Nomads in the Sahara Desert close to the town of Bir Anzerane, Oued Ed-Dahab Province in the region of Dakhla-Oued Ed-Dahab, Western Sahara. The two large pieces, weighing 864 and 495 g both had fusion crust along one side. They were subsequently purchased by a Moroccan dealer in Erfoud in April 2021 and sold to Sean Mahoney & Miguel Angel Contreras Gomez.

Physical characteristics: The 8 pieces comprise the partially crusted main mass of 864 g (Sean Mahoney), a partially crusted piece of 498 g (Miguel Angel Contreras Gomez) and 6 other small pieces (Miguel Angel Contreras Gomez).

Petrography: (D. Sheikh, Cascadia) Sample is comprised of mm-sized chondrules and refractory inclusions (Av. ~ 1 mm, ~50 vol. %) set within a fine-grained matrix (~50 vol. %) containing accessory chromite and Fe-Ni metal.

Geochemistry: Olivine (Fa28.7±19.5, range Fa1.9-65.7, n=47), Low-Ca Pyroxene (Fs2.4±1.7Wo2.2±1.1, range Fs1.2-4.4Wo1.5-3.2, n=6).

Classification: Carbonaceous Chondrite (CV3)

Specimens: 24.3 g at Cascadia, main mass with Sean Mahoney and Miguel Angel Contreras Gomez.

Data from:
  MB112
  Table 0
  Line 0:
State/Prov/County:Oued Ed-Dahab
Origin or pseudonym:Nearby to Bir Anzerane
Date:2020
Mass (g):1788
Pieces:8
Class:CV3
Shock stage:low
Weathering grade:low
Fayalite (mol%):28.7±19.5
Ferrosilite (mol%):2.4±1.7
Wollastonite (mol%):2.2±1.1
Classifier:D. Sheikh, Cascadia
Type spec mass (g):24.3
Type spec location:Cascadia
Main mass:Sean Mahoney and Miguel Angel Contreras Gomez
Comments:CML 1629; OSM006; 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)
Catalogs:
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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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Andreas Möller   
Geography:

Western Sahara
Coordinates:Unknown.

Statistics:
     This is the only approved meteorite from Oued Ed-Dahab, Western Sahara
     This is 1 of 283 approved meteorites from Western Sahara (plus 20 unapproved names)

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