Meteoritical Bulletin: Entry for Northwest Africa 4549

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Northwest Africa 4549

Basic information

Name: Northwest Africa 4549
This is an OFFICIAL meteorite name.
Abbreviation: NWA 4549
Observed fall: No
Year found: 2006
Country: (Northwest Africa)
Mass: 64 g

Classification
history:

Meteoritical Bulletin:	MB 93	(2008)	LL3.1
Recommended:			LL3.1 [explanation]

This is 1 of 9 approved meteorites classified as LL3.1. [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 1 Jan 2008
Revised 4 Aug 2008: final writeup

Writeup

help

Writeup from MB 93:

Northwest Africa 4549

Northwest Africa

Find: 2006

Ordinary chondrite (LL3.1)

History and Physical characteristics: Collected in the western part of the Sahara and purchased by A. Aaronson in Rissani, Morocco, in May 2006. It is a 64 g, reddish brown stone with very little fusion crust.

Petrography: (T. Bunch and J. Wittke, NAU) A chondrule-rich (76 vol%) ordinary chondrite with low metal (=1 vol%) and several subrounded to subangular poikilitic clasts (1.5- 2.4 mm in diameter) of anhedral orthopyroxene host and round olivine inclusions.

Mineral compositions and Geochemistry: Olivine (Fa_8.8-38.0; FeO/MnO = 28-122; Cr₂O₃ = 0.07-0.34 wt%; CaO = 0.16-0.54 wt%). Orthopyroxene (Fs_6.3-27.6). Orthopyroxene oikocrysts (Fs_16.4; FeO/MnO = 67), olivine chadacrysts (Fa_28.3; FeO/MnO = 94). Oxygen isotopes: (D. Rumble, CIW) A cleaned and metal-free sample was analyzed by laser fluorination. Replicate analyses are respectively, δ¹⁷O = 4.100 and 3.800; δ¹⁸O = 6.02 and 5.697; Δ¹⁷O = 0.9315 and 0.8032 (all ‰).

Classification: Ordinary chondrite (LL3.1); S2, W1.

Type specimens: An 13.2 g sample is on deposit at NAU. Aaronson holds the main mass.

Submitted by: T. Bunch, NAU.

Data from:
  MB93
  Table 2
  Line 62:

Place of purchase:	Rissani, Morocco
Date:	06-May-08
Mass (g):	64
Pieces:	1
Class:	LL3.1
Type spec mass (g):	13.2

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)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
CIW: Carnegie Insitution Washington, Geophysical Laboratory, 5251 Broad Branch Rd., NW, Washington DC 20015, United States (institutional address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 93, MAPS 43, 571-632 (2008)

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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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