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Northwest Africa 7441
Basic information Name: Northwest Africa 7441
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7441
Observed fall: No
Year found: 2004
Country: (Northwest Africa)
Mass:help 340 g
Meteoritical Bulletin:  MB 102  (2013)  LL3.4
Recommended:  LL3.4    [explanation]

This is 1 of 24 approved meteorites classified as LL3.4.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 19 Nov 2013
Writeup from MB 102:

Northwest Africa 7441 (NWA 7441)

(Northwest Africa)

Purchased: 2004

Classification: Ordinary chondrite (LL3.4)

Physical characteristics: Black fusion crust is mostly weathered away but is well preserved on one of the faces.

Petrography: (K. Guo, ROM): Chondrules are clearly defined on the cut surface, including a few white-colored chondrules >5 mm. One large 16 mm porphyritic chondrule with a white rim was present. The chondrules have an average diameter of 0.77±0.48 mm (N=50) and make up 75% of the thin section. Zoning of olivine is common. Troilite and silicate inclusions are common in metals. Matrix light-brown to black. Glass in the matrix appears ruby in both plain and crossed polarized light. In cathodoluminescnece (CL), the matrix is almost all nonluminescent with a few scattered areas emitting red CL. Chondrule mesostasis is non-luminescent (30%), emits dull red-blue (10%) or bright blue (60%) CL. Red CL in chondrule olivine is present but constitutes less than 10% of the areas. Olivine primarily shows sharp extinction. About 50% of the sulfides are replaced by iron oxides.

Geochemistry: Olivine Fa20.2±11.1 (N=17), low-Ca pyroxene Fs11.5±6.2 Fs11.5En87Wo2 (N=28), and high-Ca pyroxene Fs20.6±20.0En62Wo17 (N=2); PMD FeO olivine=45.6 and PMD FeO low-Ca pyroxene=46.6; σ-Cr2O3=0.11 wt%, mean Cr2O3=0.06 wt%.

Classification: Ordinary chondrite LL3.4, S1, W2

Specimens: A total of 340.18 g is on deposit at ROM.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2004
Mass (g):340.18
Shock stage:S1
Weathering grade:W2
Fayalite (mol%):20.2±11.1 (N=17)
Ferrosilite (mol%):11.5±6.2 (N=28); 0.21±0.20 (N=2)
Wollastonite (mol%):1.7±1.8; 17.3±22.8
Classifier:K. Guo, ROM
Type spec mass (g):340.18
Type spec location:ROM
Main mass:ROM
Comments:Submitted by Brendt Hyde
   and collections
ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011)
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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     This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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