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Northwest Africa 1807
Basic information Name: Northwest Africa 1807
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 1807
Observed fall: No
Year found: 2002
Country: (Northwest Africa)
Mass:help 274 g
Meteoritical Bulletin:  MB 91  (2007)  CV3
Recommended:  CV3    [explanation]

This is 1 of 470 approved meteorites (plus 2 unapproved names) classified as CV3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CV chondrites, and CV-CK clan chondrites
Comments: Approved 28 Mar 2007
Writeup from MB 91:

Northwest Africa 1807

Northwest Africa

Find: 2002

Carbonaceous chondrite (CV3)

History: M. Chinellato purchased a single stone of 274 g in Erfoud, Morocco.

Physical characteristics: The main mass of 54.5 g has no fusion crust. A cut surface on the type specimen shows rather large chondrules and some small white spots.

Petrography: (V. Moggi Cecchi and G. Pratesi, MSP) In thin section, many chondrules of various kinds (BO, PO, POP), accounting for ~50 vol% and ranging in size from 500 to 1200 µm in apparent diameter are visible (mean value 950 µm), set in a dark brown matrix. The chondrule margins are clear and defined. Chondrules contain variable amounts of clear glass. The matrix is composed of olivine and orthopyroxene, with rare clinopyroxene. Fe,Ni-rich metal and troilite are uncommon (less than 5 vol%). CAIs and rare apatite grains are observed.

Mineral compositions and geochemistry: Chondrule olivine (Fo95–99), matrix olivine (Fo50), orthopyroxene (En98.14Fs0.8Wo1.06), clinopyroxene (Fs15.54–28.61En25.12–36.97Wo46.12–47.49). Chondrule glass is anorthitic (An85). Oxygen isotopes: (I. Franchi and R. Greenwood, OU) δ17O = -1.64, δ18O = 2.52, Δ17O = -2.96 (all ‰).

Classification: Carbonaceous chondrite (CV3); S1, minor weathering.

Type specimen: A total of 20.5 g and one thin section are on deposit at MSP. MChin holds the main mass.

Plots: O isotopes:  
   and collections
MSP: Museo di Scienze Planetarie, Via Galcianese 20/H, 59100 Prato, Italy, Italy; Website (institutional address; updated 22 Oct 2022)
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)
MChin: Matteo Chinellato, Via Triestina, 126/A-30030 Tessera, Venezia, Italy; Website (private address)
References: Published in Meteoritical Bulletin, no. 91, MAPS 42, 413-466 (2007)
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Photos from the Encyclopedia of Meteorites:
Don Edwards   
Matteo Chinellato   
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)

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

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