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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:help 222 g
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 from MB 91:

Northwest Africa 2775


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 (Fa14.5±0.2; FeO/MnO = 30.5, MnO > 0.02 wt%), orthopyroxene (Fs13.3±0.2Wo3.0; FeO/MnO = 17), diopside (Fs6.8Wo41.9; FeO/MnO = 12), plagioclase (An17.4), 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:
  Table 2
  Line 114:
Place of purchase:Erfoud, Morocco
Mass (g):222
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:  
   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)
References: Published in Meteoritical Bulletin, no. 91, MAPS 42, 413-466 (2007)
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     This is 1 of 9729 approved meteorites from (Northwest Africa) (plus 1859 unapproved names)

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