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Northwest Africa 7445 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 7445 This is an OFFICIAL meteorite name. Abbreviation: NWA 7445 Observed fall: No Year found: 2004 Country: (Northwest Africa) Mass: 129.4 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 658 approved meteorites classified as Ureilite. [show all] Search for other: Achondrites, Ureilites | ||||||||||||||||||||||||||||||
Comments: | Approved 15 May 2019 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 108:
Northwest Africa 7445 (NWA 7445) (Northwest Africa) Purchased: 2004 Classification: Ureilite History: Purchased by D. DGregory in Tuscon, Arizona. Type specimen is catalogued at ROM as M52947. Physical characteristics: (S. Korchinos UTorG, ROM) The total mass of the sample is 129.41 g, with the main piece having mass of 128.47 g. The main mass has a weathered fusion crust with pervasive fractures. The surface is mostly covered with rust. Petrography: (S. Korchinos UTorG, ROM). The sample exhibits typical ureilite texture with closely packed, coarse-grained silicates meeting at triple junctions. Olivine grains exhibit minor planar fracturing, undulatory extinction, and minor reduction rims. Low-Ca pyroxene exhibits twinning and undulatory extinction. Modal abundances: major olivine approximately 70%, low-Ca pyroxene 25%, and carbon 5%. Raman analysis confirms both diamond and graphite phases, though diamond is more prevalent. Geochemistry: Mineral compositions and geochemistry: EPMA quantitative WDS (S.Korchinos, UToRG, ROM): Olivine cores have Fa24.0±1.3 (N = 17), CaO = 0.36±0.02 wt%, Cr2O3 = 0.75±0.07 wt%, and MnO = 0.40±0.02 wt%. Pyroxene cores: Fs21.0±0.3Wo6.6±0.1 (N = 10), CaO = 3.34±0.04 wt%, Cr2O3 = 1.08±0.05 wt%, MnO = 0.39±0.02 wt%. Classification: Achondrite (ureilite). Low shock, moderate weathering. Specimens: The main mass, thinly-sliced fragment, and thin section are held at the ROM. | ||||||||||||||||||||||||||||||
Data from: MB108 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) DGregory: David Gregory, 230 First Avenue, Suite 108, St. Thomas, Ontario N5R 4P5, Canada (private address) UTorG: University of Toronto, Dept. Geology, Earth Sciences Centre, 22 Russell Street Toronto, Ontario, M5S 3B1, Canada (institutional address; updated 31 Jan 2011) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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Geography: |
Statistics: This is 1 of 9589 approved meteorites from (Northwest Africa) (plus 1869 unapproved names) | ||||||||||||||||||||||||||||||
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Revision history: |
This lists important revisions made to data for this record.
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