Meteoritical Bulletin: Entry for Northwest Africa 2656

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Northwest Africa 2656

Basic information

Name: Northwest Africa 2656
This is an OFFICIAL meteorite name.
Abbreviation: NWA 2656
Observed fall: No
Year found: 2003
Country: (Northwest Africa)
Mass: 7.5 kg

Classification
history:

Meteoritical Bulletin:	MB 90	(2006)	Acapulcoite
Recommended:			Acapulcoite [explanation]

This is 1 of 94 approved meteorites classified as Acapulcoite. [show all]
Search for other: Acapulcoite-lodranite family, Acapulcoites, and Primitive achondrites

Comments:

Approved 25 Jun 2006
Revised 3 Feb 2006: Revised writeup

Writeup

help

Writeup from MB 90:

Northwest Africa 2656

Morocco or Algeria

Find: 2003

Achondrite (acapulcoite)

History: A 386 g broken stone with weathered fusioncrust (part of a larger ~7.5 kg mass found in 2003) was purchased in Erfoud, Morocco, in 2004 for N. Oakes.

Petrography: (T. Bunch and J. Wittke, NAU; A.Irving, UWS) The specimen is recrystallized into homogeneous polygonaland subhedral grains with a grain size of <1 mm and a ~ equal distributionof phases.

Composition: Olivine (Fa_8.0; FeO/MnO = 16–19 [n =25]), orthopyroxene (Fs_8.4Wo_2.4; [n = 17]), plagioclase(An_{18.3– 21.0}Or_2.8–3.4), chromite ((Cr/Cr+Al) = 0.85;Mg/(Mg+Fe) = 0.41). Troilite, schreibersite, and kamacite are also present.Oxygen isotopes: (D. Rumble, CIW) Replicate analyses by laser fluorination gaveδ¹⁷O = 1.71, 1.69; δ¹⁸O = 5.05, 5.04; ∆¹⁷O= −0.953, −0.973 (all ‰).

Classification: Achondrite (acapulcoite); low shock,moderate weathering.

Specimens: A 21 g type specimen and one polished thinsection are on deposit at NAU*. Oakes holds the main mass.

Data from:
  MB113
  Table 0
  Line 0:

Classifier:	T. Bunch and J. Wittke, NAU; A. Irving, UWS
Type spec location:	NAU* type specimen now at UWB. 21 g at UWB; remainder with owner.
Comments:	Work name 575, thin section QOC1

Data from:
  MB90
  Table 2
  Line 38:

Place of purchase:	Unknown
Date:	2003
Mass (g):	386
Pieces:	1
Class:	Acp
Shock stage:	Low
Weathering grade:	W3
Fayalite (mol%):	8
Ferrosilite (mol%):	8.4
Type spec mass (g):	21

Plots:

O isotopes:

Institutions
and collections

NAU*: Collection discontinued. Specimens redistributed as shown in individual meteorite records, United States (institutional address; updated 24 Jun 2024)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
CIW: Carnegie Insitution Washington, Geophysical Laboratory, 5251 Broad Branch Rd., NW, Washington DC 20015, United States (institutional address)
Oakes: Nelson Oakes, Route 1, House 50C, Uniondale, PA 18470, United States; Website (private address)
NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States (institutional address; updated 12 Apr 2012)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 90, MAPS 41, 1383-1418 (2006)
Published in Meteoritical Bulletin, no. 113, in preparation (2024)

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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
David Hardy

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9921 approved meteorites from (Northwest Africa) (plus 1838 unapproved names)

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