Meteoritical Bulletin: Entry for Northwest Africa 2775

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Northwest Africa 2775

Basic information

Name: Northwest Africa 2775
This is an OFFICIAL meteorite name.
Abbreviation: NWA 2775
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass: 222 g

Classification
history:

Meteoritical Bulletin:	MB 91	(2007)	Acapulcoite
Recommended:			Acapulcoite [explanation]

This is 1 of 93 approved meteorites classified as Acapulcoite. [show all]
Search for other: Acapulcoite-lodranite family, Acapulcoites, and Primitive achondrites

Comments:

Approved 1 Sep 2006

Writeup

help

Writeup from MB 91:

Northwest Africa 2775

Algeria

Find: 2005

Achondrite (acapulcoite)

History and physical characteristics: A dark brown, 222 g, partially crusted stone was purchased in Erfoud, Morocco, in November 2005.

Petrography: (J. Wittke and T. Bunch, NAU; A. Irving, UWS) Recrystallized homogeneous, polygonal to subhedral grains <0.8 mm in size.

Mineral compositions and geochemistry: Olivine (Fa_14.5±0.2; FeO/MnO = 30.5, MnO > 0.02 wt%), orthopyroxene (Fs_13.3±0.2Wo_3.0; FeO/MnO = 17), diopside (Fs_6.8Wo_41.9; FeO/MnO = 12), plagioclase (An_17.4), Fe,Ni rich metal (Ni = 22.5 wt%). FeS is also observed. Oxygen isotopes: (D. Rumble, CIW) Multiple analyses of different samples of the rock by laser fluorination are δ¹⁷O = + 0.78 and + 0.97, δ¹⁸O = +2.94 and +3.25, Δ¹⁷O = −0.764 and −0.743 (all ‰).

Classification: Achondrite (acapulcoite).

Type specimen: A 20.1 g sample is on deposit at NAU. Turecki and Reed hold the main mass.

Data from:
  MB91
  Table 2
  Line 114:

Place of purchase:	Erfoud, Morocco
Date:	2005
Mass (g):	222
Pieces:	1
Class:	Acp
Classifier:	T. Bunch and J. Wittke, NAU
Type spec mass (g):	20.1
Type spec location:	NAU
Main mass:	Turecki and Reed

Plots:

O isotopes:

Institutions
and collections

NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
CIW: Carnegie Insitution Washington, Geophysical Laboratory, 5251 Broad Branch Rd., NW, Washington DC 20015, United States (institutional address)
Reed: Blaine Reed, P.O. Box 1141, Delta, CO 81416, United States; Website (private address)
Turecki: Stan Turecki, 5618 Regis Ave., Port Richey, Florida, United States (private address; updated 28 Dec 2010)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 91, MAPS 42, 413-466 (2007)

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

Also see:

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Revision
history:

This lists important revisions made to data for this record.

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