Meteoritical Bulletin: Entry for Northwest Africa 2724

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Northwest Africa 2724

Basic information

Name: Northwest Africa 2724
This is an OFFICIAL meteorite name.
Abbreviation: NWA 2724
Observed fall: No
Year found: 2004
Country: (Northwest Africa)
Mass: 3.8 kg

Classification
history:

Meteoritical Bulletin:	MB 90	(2006)	Eucrite-pmict
Recommended:			Eucrite [explanation]

This is 1 of 508 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 3 Feb 2006

Writeup

Writeup from MB 90:

Northwest Africa 2724

Northwest Africa

Find: 2004

Achondrite (eucrite, polymict)

History: A 3804 g crusted complete stone was purchased in Erfoud, Morocco, in 2004.

Petrography: (J. Wittke and T. Bunch, NAU) The specimen mostly consists of cumulate basalt clasts that range from coarse-grained (~2 mm) to very fine-grained (~0.1 mm) with less than 5 vol% of subophitic basalts observed. Cumulate basaltic clasts are unusually low in ilmenite, chromite, and metal compared with other cumulate eucrites.

Composition: Despite the large range in grain size, pyroxene compositions show a rather narrow range: low-Ca pyroxenes (Fs_59.1–62Wo_3.2–3.8), pigeonite (Fs_46.5–51Wo_12.4–16.6), Ca-rich pyroxenes (Fs_40–2.1Wo_30.5–40.5), plagioclase (An_89.4–92.7).

Classification: Achondrite (eucrite, polymict); low shock, minimal weathering.

Specimens: A 34 g type specimen is on deposit at NAU. E. Thompson holds the main mass.

Data from:
  MB90
  Table 2
  Line 66:

Place of purchase:	Erfoud, Morocco
Date:	2004
Mass (g):	3804
Pieces:	1
Class:	Euc
Shock stage:	low-medium
Weathering grade:	minimal
Type spec mass (g):	21

Institutions
and collections

NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
Thompson: Edwin Thompson, 5150 Dawn St., Lake Oswego, OR 97035, United States (private address)

Catalogs:

References:

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

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Photos:

Credit	Photos
Photos from the Encyclopedia of Meteorites:
Gi-po Meteorites
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Andreas Grünemeyer
AR
Michael S. Scherman
Woreczko Jan & Wadi

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 7810 approved meteorites from (Northwest Africa) (plus 1971 unapproved names)

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