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Northwest Africa 2748
Basic information Name: Northwest Africa 2748
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 2748
Observed fall: No
Year found: 2004
Country: (Northwest Africa)
Mass:help 57 g
Meteoritical Bulletin:  MB 91  (2007)  LL3.4 ? 0.2
Recommended:  LL3.4    [explanation]

This is 1 of 24 approved meteorites classified as LL3.4.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 1 Sep 2006
Revised 10 Apr 2007: Corrected typo in classification
Writeup from MB 91:

Northwest Africa 2748

Northwest Africa

Find: February 2002

Ordinary chondrite (LL3.4)

History: A single stone was purchased in February 2002 from a trader in Erfoud, Morocco, by R. Elliott.

Physical characteristics: The 57 g stone is partly covered in dark brown fusion crust. Patches of limonitic surface coating are present, from which irregular veins penetrate the interior. Abundant large chondrules are visible to the unaided eye.

Petrography: (R. Hutchison and A. Kearsley, NHM; P. Sipiera, Harper) Chondrules constitute >80% of the stone and range up to >4 mm in size. The mean apparent size of 183 chondrules is 0.89 ± 0.48 mm. The chondrules have sharply defined margins and many are mutually indented, resembling compound chondrules. PO and POP chondrules dominate. A 1.3 mm spinel-pyroxene CAI was identified. Zoning is common at chondrule margins. Little metal has survived terrestrial alteration but some kamacite and taenite are present.

Mineral compositions and geochemistry: In chondrules, the minimum range of olivine cores is Fo99–65. One analysis of matrix yielded Mg/(Mg + Fe) = 32. A 4 mm PO chondrule fragment has zoned olivines whose cores are Fo85 with Ni = 0.74 wt%. A type IA PO chondrule has olivines (Fo99–97) with CaO = 0.6–0.9 wt%. Oxygen isotopes: (R. C. Greenwood, OU) δ17O = 4.870, 4.914; δ18O = 7.176, 7.242; Δ17O = +1.138, +1.148 (all ‰, the second values are replicates).

Classification: Ordinary chondrite (LL3.4 ± 0.2).

Type specimen: A 10.86 g part-slice (BM 2004, M.6) and one thin section are in NHM. A 3 g sample and one thin section are held by DuPont. A 5.15 g slice is with R. Hutchison, NHM. Fernlea holds the main mass.

Data from:
  Table 2
  Line 112:
Place of purchase:Erfoud, Morocco
Date:2004 Jun
Mass (g):57
Class:LL3.4 ± 0.2
Shock stage:S2
Weathering grade:W3
Fayalite (mol%):1-35
Classifier:R. Hutchison and A. Kearsley, NHM
Type spec mass (g):13.86
Type spec location:NHM
Main mass:Fernla
Comments:Corrected typo in classification 10 Apr 2007
Plots: O isotopes:  
   and collections
NHM: Department of Mineralogy, The Natural History Museum, Cromwell Road, London SW7 5BD, United Kingdom; Website (institutional address; updated 9 Dec 2011)
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
DuPont: James M. DuPont Meteorite Collection, Deposited at FMNH in 2008., United States (private address; updated 1 Jun 2012)
Fernlea: Rob Elliott, Fernlea Meteorites, Milton of Balgonie, Fife. KY7 6PY, Scotland, United Kingdom; Website (private address)
Harper: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
Search for this meteorite in the Natural History Museum collection (U.K.):   
    Require NHM photo
References: Published in Meteoritical Bulletin, no. 91, MAPS 42, 413-466 (2007)
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     This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

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