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Northwest Africa 4508 | |||||||||||||
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Basic information | Name: Northwest Africa 4508 This is an OFFICIAL meteorite name. Abbreviation: NWA 4508 Observed fall: No Year found: 2001 Country: (Northwest Africa) Mass: ![]() | ||||||||||||
Classification history: |
This is 1 of 649 approved meteorites classified as Ureilite. [show all] Search for other: Achondrites, Ureilites | ||||||||||||
Comments: | Approved 24 Jul 2007 | ||||||||||||
Writeup![]() |
Writeup from MB 92:
Northwest Africa 4508 Northwest Africa Find:2001 Achondrite (ureilite) History: Purchased in Rissani, Morocco in April 2001. Physical characteristics: One subrounded blocky mass (5x3x2 cm) of 182 g and covered with dark brown, moderately weathered fusion crust. Petrography: (H. Takeda, Chiba and A. Yamaguchi, NIPR). The sample contains fine-grained, granoblastic olivine, partly darkened pyroxene with carbonaceous (graphite) veins at grain boundaries. Minor weathering and heavily shocked. A few grains of pyroxene or olivine crystals form larger grains (0.7x0.4 to 3x1 mm). An original olivine crystal is broken into many very fine crystallites to show a granoblastic texture. There is an unusual texture of pyroxene crystals found in one of the sections studied. Mineral compositions and geochemistry: Olivine (Fo83-86 [cores], up to Fo89 [rims]); pigeonite (Fs14Wo7; Wo6-10 range). Oxygen Isotopes: (M. Kusakabe, OkaU) δ17O = 2.97, δ18O = 7.66 (both ‰). Classification: Achondrite (ureilite). Type specimen: A total of 20.2 g of sample and one thin section are on deposit at NIPR. Fectay holds the main mass. | ||||||||||||
Data from: MB92 Table 2 Line 84: |
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Plots: | O isotopes: | ||||||||||||
Institutions and collections |
NIPR: Antarctic Meteorite Research Center, National Institute of Polar Research, 10-3 Midori-cho, Tachikawa, Tokyo 190-8518, Japan; Website (institutional address; updated 9 Dec 2013) Chiba: Chiba Institute of Technology, Tsudanuma, Narashino, Chiba 275-0016, Japan (institutional address) Fectay: Bruno Fectay and Carine Bidaut, La Memoire de la Terre SARL, 39800 Aumont, France; Website (private address) OkaU: Institute for Study of the Earth's Interior, Okayama University, Misasa Tottori 682-0193, Japan (institutional address) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 92, MAPS 42, 1647-1694 (2007)
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Geography: |
Statistics: This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names) |