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Northwest Africa 4872
Basic information Name: Northwest Africa 4872
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4872
Observed fall: No
Year found: 2007
Country: Algeria
Mass:help 3 kg
Meteoritical Bulletin:  MB 93  (2008)  Brachinite
Recommended:  Brachinite    [explanation]

This is 1 of 60 approved meteorites classified as Brachinite.   [show all]
Search for other: Brachinites, Primitive achondrites
Comments: Approved 14 Jan 2008
Revised 17 Dec 2008: added erratum from mb94; 2008-08-04 final writeup
Writeup from MB 93:

Northwest Africa 4872


Find: 2007

Achondrite (brachinite)

History and Physical characteristics: A 3000 g partially crusted complete stone was purchased in Rissani, Morocco, in 2007. This stone is very dark on both crusted and wind eroded surfaces and has a low weathering grade.

Petrography: (T. Bunch and J. Wittke, NAU) Protogranular texture with a strong bimodal olivine grain size: medium-sized grains range from 0.3 to 1.1 mm (mean = 0.6 mm) and the smaller grains range from 0.02 to 0.3 mm (mean = 0.18 mm). Small metal grains are oxidized. Mineral modes (in vol%): olivine = 85; Ca pyroxene = 3; chromite = 5; Cl apatite = 3; metal = 2; sulfides = 2.

Mineral compositions: Olivine (Fa35.1; FeO/MnO = 81), Ca-pyroxene (Fs10.3Wo47), chromite (Cr/(Cr + Al) = 0.74), metal (Ni = 3.5 wt%), with pentlandite and troilite. Oxygen isotopes: (D. Rumble, CIW) Replicate analyses of acid-washed material by laser fluorination gave, respectively: δ17O, -0.229 and -0.254; δ18O, 2.061 and 2.012; and Δ17O, 4.354 and 4.308 (all ‰).

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

Type specimens: A total of 20.4 g is on deposit at NAU. Aaronson is the main mass holder.

Submitted by: T. Bunch, NAU.

Writeup from MB 94:

Correction: δ17O = 2.061, 2.012; δ18O = 4.354, 4.308; Δ17O = -0.229,-0.254 (all ‰). 

Data from:
  Table 2
  Line 139:
Place of purchase:Rissani, Morocco
Mass (g):3000
Type spec mass (g):20.4
Plots: O isotopes:  
   and collections
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)
NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States (institutional address; updated 12 Apr 2012)
References: Published in Meteoritical Bulletin, no. 93, MAPS 43, 571-632 (2008)
Published in Meteoritical Bulletin, no. 94, MAPS 43, 1551-1588 (2008)
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     This is 1 of 1368 approved meteorites from Algeria (plus 31 unapproved names) (plus 4 impact craters)

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