Meteoritical Bulletin: Entry for Northwest Africa 4969

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Northwest Africa 4969

Basic information

Name: Northwest Africa 4969
This is an OFFICIAL meteorite name.
Abbreviation: NWA 4969
Observed fall: No
Year found: 2007
Country: (Northwest Africa)
Mass: 180 g

Classification
history:

Meteoritical Bulletin:	MB 93	(2008)	Brachinite
Recommended:			Brachinite [explanation]

This is 1 of 59 approved meteorites classified as Brachinite. [show all]
Search for other: Brachinites, Primitive achondrites

Comments:

Approved 14 Jan 2008
Revised 4 Aug 2008: final writeup

Writeup

help

Writeup from MB 93:

Northwest Africa 4969

Northwest Africa

Find: 2007

Achondrite (brachinite)

History and Physical characteristics: A 180 g incomplete stone was purchased in Erfoud, Morocco, by M. Cimała in 2007. It is partially covered by a thin transparent ablation crust.

Petrography: (J. Wittke and T. Bunch, NAU) Fine- to medium-grained (0.1 to 1.2 mm; mean = 0.75 mm) with protogranular texture. Mineral modes (in vol%): olivine = 89, Ca-pyroxene = 6, plagioclase = 2.5, chromite = 1.5; metal and FeS = 1.

Mineral compositions: Olivine is Fa_34.7, FeO/MnO = 72-75; diopside is Fs_10.0Wo_46.4 (Cr₂O₃ = 0.88-1.2 wt%; Al₂O₃ = 1.24 wt%), FeO/MnO = 42; plagioclase is An_34.6 and chromite Cr/(Cr + Al) = 0.71. Metal is predominantly taenite (Ni = 20.1 wt%).

Classification: Achondrite (brachinite); moderate shock and minimal weathering.

Type specimens: A total of 20.6 g are on deposit at NAU. Cimała holds the main mass.

Submitted by: T. Bunch, NAU.

Data from:
  MB93
  Table 2
  Line 157:

Place of purchase:	Erfoud, Morocco
Date:	2007
Mass (g):	180
Pieces:	1
Class:	Brach
Type spec mass (g):	20.6

Institutions
and collections

NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)

Catalogs:

References:

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

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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Dirk Hohmann
Domjan Svilkovic

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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Revision
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