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Northwest Africa 2180
Basic information Name: Northwest Africa 2180
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 2180
Observed fall: No
Year found: 2002
Country: (Northwest Africa)
Mass:help 369 g
Meteoritical Bulletin:  MB 91  (2007)  CV3
Recommended:  CV3    [explanation]

This is 1 of 552 approved meteorites (plus 1 unapproved name) 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 2180

Northwest Africa, purchased Erfoud

Find: 2002

Carbonaceous chondrite (CV3)

History: A number of stones were bought in Erfoud, Morocco, by an anonymous buyer, who owns the main mass.

Physical characteristics: The total mass is 369.3 g. The main mass weighs 51.4 g and has very small portions of a dark brown 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, several chondrules of various kinds (BO, PO, POP) accounting for ~50 vol% and ranging from 500 to 600 µm in size are visible, set in a fine intergrowth within phyllosilicates. The chondrule margins are clear and defined. Chondrules contain variable amounts of clear glass. The matrix is represented by olivine and orthopyroxene, with rare clinopyroxenes. Fe,Ni metal and troilite are uncommon (<5 vol%). CAIs and rare apatite grains are also observed.

Mineral compositions and geochemistry: Chondrule olivine (Fo91–99), matrix olivine (Fo31–56), orthopyroxene (En98.1Wo1.1), clinopyroxene (Fs0.5–0.9En59.4–93.2Wo6.3–39.6). Chondrule glass is anorthitic (An90). Oxygen isotopes: (I. Franchi and R. Greenwood, OU) δ17O = −0.718, δ18O = 4.032, Δ17O = −2.815 (all ‰).

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

Type specimen: A total of 20.7 g and one thin section are on deposit at MSP. An anonymous buyer holds the main mass.

Data from:
  Table 2
  Line 70:
Mass (g):369.3
Shock stage:S1
Weathering grade:minimal
Fayalite (mol%):1-9
Ferrosilite (mol%):1.9
Classifier:V. Moggi Cecchi and G. Pratesi, MSP
Type spec mass (g):20.7
Type spec location:MSP
Main mass:anonymous
Plots: O isotopes:  
   and collections
MSP: Museo di Scienze Planetarie, Via Galcianese 20/H, 59100 Prato, Italy, Italy; Website (institutional address; updated 5 Mar 2014)
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)
References: Published in Meteoritical Bulletin, no. 91, MAPS 42, 413-466 (2007)
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Photos from the Encyclopedia of Meteorites:
Matteo Chinellato   
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
David Hardy   
Matteo Chinellato      
Woreczko Jan & Wadi   

     This is 1 of 7579 approved meteorites from (Northwest Africa) (plus 1969 unapproved names)

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