![]() |
||
|
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: ![]() | ||||||||||||||||||||
Classification history: |
This is 1 of 391 approved meteorites classified as Eucrite-pmict. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||
Comments: | Approved 9 Sep 2006 | ||||||||||||||||||||
Writeup![]() |
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: |
|
||||||||||||||||||||
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)
| ||||||||||||||||||||
Geography: |
Statistics: This is 1 of 8890 approved meteorites from (Northwest Africa) (plus 1871 unapproved names) |