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Northwest Africa 4748
Basic information Name: Northwest Africa 4748
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4748
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 80 g
Classification
  history:
Meteoritical Bulletin:  MB 94  (2008)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 358 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 8 Sep 2008
Writeuphelp
Writeup from MB 94:

Northwest Africa 4748

Northwest Africa

Find: 2005

Achondrite (eucrite, polymict)

History: The meteorite was bought by the main mass holder from a Moroccan dealer during the Munich Mineral Fair, Germany, 2005. The exact find location is not known.

Physical characteristics: Single oval stone of 80 g with a partly weathered shiny black fusion crust. The half of the stone that was wedged in the ground is covered with carbonate.

Petrography: (J. Schlüter, Hamb) Breccia, rich in mineral fragments with few lithic fragments. Rich in troilite and metal with metal grains up to 2 mm in size. Troilite occurs finely dispersed throughout the meteorite, attached to metal grains and frequently as symplectitic intergrowths with clinopyroxene (up to 400 μm in size). The main silicate phases are calcic plagioclase and clinopyroxene (pigeonite), which shows fine exsolution lamellae. Microprobe analyses of such grains give intermediate values. Further subordinate to rare components are chromite, orthopyroxene, olivine and silica.

Geochemistry: Plagioclase (n = 18) An94.09Ab5.79Or0.12, pigeonite (n = 13) Fs44.49En53.23Wo2.28. Several further clinopyroxene grains with differing chemistry (higher Wo or lower Fs). Orthopyroxene (n = 2) Fs26.62En70.63Wo2.75. Olivine in a lithic fragment (n = 2) Fa33.60. Metal with 5.09 wt% Ni (n = 3) and 40.15 wt% Ni (n = 1).

Classification: Achondrite, brecciated (eucrite, polymict). Appears to have a low degree of shock and minor weathering.

Type specimens: A 17 g sample and one polished thin section are on deposit at Hamb. Wuthenau, holds the main mass.

Data from:
  MB94
  Table 2
  Line 57:
State/Prov/County:Northwest Africa
Date:2005
Mass (g):80
Pieces:1
Class:Polymict eucrite
Fayalite (mol%):33.6
Ferrosilite (mol%):44.5, 26.6
Wollastonite (mol%):2.3, 2.3
Classifier:J. Schlüter, Hamb
Type spec mass (g):17
Type spec location:HAMB
Main mass:Wuthenau
Institutions
   and collections
Hamb: Mineralogisches Museum, Universität of Hamburg, Grindelallee 48, D-20146 Hamburg, Germany; Website (institutional address; updated 22 Feb 2013)
Wuthenau: No contact information provided. (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 94, MAPS 43, 1551-1588 (2008)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7937 approved meteorites from (Northwest Africa) (plus 1960 unapproved names)

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