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Northwest Africa 4903
Basic information Name: Northwest Africa 4903
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4903
Observed fall: No
Year found: 2007
Country: (Northwest Africa)
Mass:help 280 g
Classification
  history:
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 379 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 17 Oct 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 4903 (NWA 4903)

(Northwest Africa)

Purchased: 2007

Classification: HED achondrite (Eucrite, polymict)

History: The meteorite was purchased from a local meteorite dealer in Tagounite, Morocco.

Physical characteristics: Dark grayish rock without fusion crust.

Petrography: The meteorite is a polymict breccia composed of up to 7 mm sized basaltic, gabbroic, and impact melt clasts and mineral fragments set in a fine-grained clastic matrix. Main minerals are exsolved pyroxene, compositionally zoned low-Ca pyroxene, and calcic plagioclase. Minor phases include silica, chromite, FeS, ilmenite, and fayalite. No metallic iron was found.

Geochemistry: low-Ca pyroxene: Fs51.0±1.0Wo2.9±0.7 (Fs49.4-52.5Wo1.9-3.9, FeO/MnO=28-32, n=12); augite exsolution lamellae: Fs23.9±1.5Wo43.4±0.9 (Fs21.7-27.3Wo41.5-44.2, FeO/MnO=25-32, n=11); zoned low-Ca pyroxene: Fs35.9±4.9Wo5.4±0.7 (Fs29.4-43.0Wo4.6-6.8, n=10, FeO/MnO=26-33, n=10); calcic plagioclase: An90.8±4.5 (An84.6-95.9, n=12)

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Tagounite, Morocco
Date:P 2007
Mass (g):280
Pieces:1
Class:Eucrite-pmict
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):51.0; 23.9; 35.9
Wollastonite (mol%):2.9; 43.4; 5.4
Classifier:A. Greshake, MNB
Type spec mass (g):20.1
Type spec location:MNB
Main mass:Stefan Ralew
Comments:Submitted by Ansgar Greshake
Institutions
   and collections		 MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8559 approved meteorites from (Northwest Africa) (plus 1896 unapproved names)

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