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Northwest Africa 7441 | |||||||||||||||||||||||||||||||
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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: ![]() | ||||||||||||||||||||||||||||||
Classification history: |
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![]() |
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: MB102 Table 0 Line 0: |
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Institutions and collections |
ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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Geography: |
Statistics: This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names) |