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Northwest Africa 4970
Basic information Name: Northwest Africa 4970
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4970
Observed fall: No
Year found: 2007
Country: (Northwest Africa)
Mass:help 394 g
Classification
  history:
Recommended:  Ureilite    [explanation]

This is 1 of 676 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 13 Sep 2024
Writeuphelp
Writeup from MB 113:

Northwest Africa 4970 (NWA 4970)

(Northwest Africa)

Purchased: 2007

Classification: Ureilite

History: Purchased by Marcin Cimala in 2007 from a dealer in Erfoud, Morocco.

Petrography: (A. Irving, UWS, and J. Boesenberg, BrownU) The specimen has a protogranular texture (mean grainsize ~1 mm) and is composed predominantly of olivine (with reduced magnesian rims) and pigeonite accompanied by minor orthopyroxene. Reduced rims on olivine contain abundant blebby Fe metal. Some secondary calcite and barite are present.

Geochemistry: Olivine cores (Fa21.4-21.6, Cr2O3 0.7-0.9 wt.%, CaO 0.4 wt.%, N = 5), olivine rims (Fa1.8-9.8, N = 10), pigeonite (Fs8.1-10.8Wo6.6-8.9; Fs18.2-18.9Wo 6.0-6.2; Al2O3 0.1-0.4 wt.%, Cr2O3 1.0-1.2 wt.%, TiO2 0.02-0.06 wt.%, N = 10), orthopyroxene (Fs16.8-17.7Wo4.0-4.3, N = 2).

Classification: Ureilite.

Specimens: 24 g including one polished thin section at YPMNH; remainder with Mr. M. Cimala.

Data from:
  MB113
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2007
Mass (g):394
Pieces:1
Class:Ureilite
Shock stage:low
Weathering grade:low
Fayalite (mol%):21.4-21.6; 1.8-9.8
Ferrosilite (mol%):16.8-17.7; 8.1-10.8; 18.2-18.9
Wollastonite (mol%):4.0-4.3; 6.6-8.9; 6.0-6.2
Classifier:A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):24
Type spec location:YPMNH
Main mass:M. Cimala
Comments:Work names TB1175 and MC043; submitted by A. Irving
Institutions
   and collections		 UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
YPMNH: Yale University Peabody Museum of Natural History P.O. Box 208118 New Haven, CT 06520-8118 , United States; Website (institutional address; updated 30 Aug 2014)
BrownU: Brown University Dept of Earth, Environmental and Planetary Sciences (DEEPS) 324 Brook Street Providence, RI 02912 , United States (institutional address; updated 21 Jul 2024)
Catalogs:
References: Published in Meteoritical Bulletin, no. 113, in preparation (2024)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9933 approved meteorites from (Northwest Africa) (plus 1837 unapproved names)

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