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Northwest Africa 2784
Basic information Name: Northwest Africa 2784
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 2784
Observed fall: No
Year found: 2004
Country: (Northwest Africa)
Mass:help 141 g
Classification
  history:
Meteoritical Bulletin:  MB 90  (2006)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 355 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 9 Sep 2006
Writeuphelp
Writeup from MB 90:

Northwest Africa 2784

Morocco

Find: 2004

Achondrite (eucrite, polymict breccia)

History: A 141 g stone was purchased in Erfoud, Morocco, in October 2004.

Petrography: (T. Bunch and J. Wittke, NAU) A brecciated cumulate host (grain size up to 2.1 mm) with clasts of subophitic (maximum grain size, 0.12 mm) and recrystallized granular (average grain size, 0.03 mm) basalts.

Geochemistry: All analyzed lithologies are very similar in pyroxene and plagioclase composition. Orthopyroxenes (Fs62–64.1Wo2.1–2.8), Ca-rich pyroxene (Fs27–31.1Wo43.7–44.8), and plagioclase (An87.8–89.7). Pigeonite exsolution lamellae are too thin to analyze; cumulate contains Cr-rich ilmenite (Cr2O3 = 15.1 wt%) and Cr-poor ilmenite. Other lithologies contain chromite of similar composition, Cr/(Cr+Al) = 0.85, and minor ilmenite.

Classification: Achondrite (eucrite, polymict breccia); low shock (no maskelynite), minimal weathering.

Specimens: A 25 g type specimen is on deposit at NAU. Birdsell holds the main mass.

Data from:
  MB90
  Table 2
  Line 95:
Place of purchase:Unknown
Date:2005
Mass (g):141
Pieces:1
Class:Euc
Shock stage:Low
Weathering grade:W1
Classifier:J. Wittke and T. Bunch
Type spec mass (g):27
Type spec location:NAU
Institutions
   and collections		 NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
Birdsell: Arizona Skies Meteorites, P.O. Box 2412, Flagstaff, AZ 86003, United States; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 90, MAPS 41, 1383-1418 (2006)
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7820 approved meteorites from (Northwest Africa) (plus 1971 unapproved names)

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