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Northwest Africa 4876
Basic information Name: Northwest Africa 4876
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4876
Observed fall: No
Year found: 2007
Country: (Northwest Africa)
Mass:help 130 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
Writeuphelp
Writeup from MB 93:

Northwest Africa 4876

Northwest Africa

Find: 2007

Achondrite (brachinite)

History and Physical characteristics: A 130 g stone was purchased in Tagounit, Morocco, in June 2007. Surface is well polished by desert wind ablation with very little oxidation.

Petrography: (J. Wittke and T. Bunch, NAU) Dunitic rock with very fine- to medium-grained (0.02 to 1.35 mm) protogranular texture. Mineral modes (vol%): olivine = 90, Ca-pyroxene = 5, plagioclase = 2, chromite, metal, and FeS = 3. No phosphates were found.

Mineral compositions: Olivine (Fa33.4; FeO/MnO = 68), Ca pyroxene (Fs13Wo43.8), plagioclase (An38.1), chromite (Cr/(Cr + Al) = 0.73), and metal (Ni = 4.1-6.4 wt%).

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

Type specimens: A total of 20.2 g is on deposit at NAU. The main mass holder is anonymous.

Submitted by: T. Bunch, NAU.

Data from:
  MB93
  Table 2
  Line 141:
Place of purchase:Tagounit, Morocco
Date:June 2007
Mass (g):130
Pieces:1
Class:Brach
Type spec mass (g):20.2
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)
Find references in NASA ADS:
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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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