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Northwest Africa 4663
Basic information Name: Northwest Africa 4663
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4663
Observed fall: No
Year found: 2006
Country: (Northwest Africa)
Mass:help 564 g
Meteoritical Bulletin:  MB 93  (2008)  Lodranite
Recommended:  Lodranite    [explanation]

This is 1 of 82 approved meteorites classified as Lodranite.   [show all]
Search for other: Acapulcoite-lodranite family, Lodranites, and Primitive achondrites
Comments: Approved 1 Jan 2008
Revised 17 Dec 2008: Erratum to oxygen isotopes; 2008-08-04: final writeup
Writeup from MB 93:

Northwest Africa 4663

Northwest Africa

Find: 2006

Achondrite (lodranite)

History and Physical characteristics: A 564 g dark stone with desert varnish with almost no fusion crust was found in the Sahara in 2006 and purchased by A. Aaronson in October 2006.

Petrography: (T. Bunch and J. Wittke, NAU) Protogranular texture with a grain size (metal excluded) of 0.2 to 1.65 mm; the mean is 0.9 mm. Metal grains are as large as 2.2 mm, the mean is 1.25 mm. Oikocrysts of orthopyroxene enclose olivine, a poikilitic texture, and Ca pyroxene contains very thin (<0.002 mm) orthopyroxene exsolution lamellae. Irregular patches of vermicular FeS (<0.01 mm) occur mostly within orthopyroxene. Mineral modes (vol%) are: orthopyroxene = 36, olivine = 30, metal and oxidized metal = 17, troilite = 8, diopside = 8, and plagioclase = 1.

Mineral compositions and Geochemistry: Orthopyroxene (Fs10.0-10.3Wo2.2-2.8; FeO/MnO = 13), olivine (Fa5.4-6.1; FeO/ MnO = 17), diopside (Fs4.3Wo45.9), metal (Ni = 4.7- 10.3 wt%) and plagioclase (An20Or2.7). Oxygen isotopes: (D. Rumble, CIW) A cleaned and metal-free sample was analyzed by laser fluorination. Replicate analyses are respectively, δ17O = -1.025 and -0.917; δ18O = 1.15 and 1.20; Δ17O = 4.13 and 4.01 (all ‰).

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

Type specimens: A 23 g sample is on deposit at NAU. Aaronson holds the main mass.

Submitted by: T. Bunch, NAU.

Writeup from MB 94:

Correction: δ17O = 1.144, 1.202; δ18O = 4.125, 4.015; Δ17O = -1.025,-0.910 (all ‰).

Data from:
  Table 2
  Line 90:
Mass (g):564
Type spec mass (g):23
Plots: O isotopes:  
   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)
References: Published in Meteoritical Bulletin, no. 93, MAPS 43, 571-632 (2008)
Published in Meteoritical Bulletin, no. 94, MAPS 43, 1551-1588 (2008)
Find references in NASA ADS:
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     This is 1 of 7328 approved meteorites from (Northwest Africa) (plus 1973 unapproved names)

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