陨石 NWA 8167 变质岩 Ureilite 全切片 - 20.55 g

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由Francesco Moser精選

Full slice of the Ureilite Meteorite NWA 8167 Northwest Africa 8167 (NWA 8167) Mauritania Find: 2012 Classification: Ureilite History: Discovered by local people in the NW area of Mauritania in 2012, purchased in Nouadhibou in 2012 Oct. Physical characteristics: One brown fragment of 435 g. Saw-cut shows brown close packed grains and tiny lustrous needles. Petrography: Microprobe examination of a thin section shows olivine and pyroxene crystallites with triple junctions, grain size 0.4-2 mm. Grain boundaries occupied with graphite and metal. Geochemistry: Olivine: Fa17.5±4.8 (Fa5.7-22.3; Cr2O3=0.6-0.8 wt.%; Fe/Mn=35, n=21). Pyroxene: Fs14-18Wo5 (n=14). Kamacite: Ni=3.9, Co=0.5, Si wt.% (n=4). Classification: Ureilite full slice 54 x 48 x 3.5 mm scale cube is 1 x 1 x 1 cm International meteorite collector association member number #3503

編號 102798401

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陨石 NWA 8167 变质岩 Ureilite 全切片 - 20.55 g

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Full slice of the Ureilite Meteorite NWA 8167

Northwest Africa 8167 (NWA 8167)
Mauritania
Find: 2012
Classification: Ureilite

History: Discovered by local people in the NW area of Mauritania in 2012, purchased in Nouadhibou in 2012 Oct.

Physical characteristics: One brown fragment of 435 g. Saw-cut shows brown close packed grains and tiny lustrous needles.

Petrography: Microprobe examination of a thin section shows olivine and pyroxene crystallites with triple junctions, grain size 0.4-2 mm. Grain boundaries occupied with graphite and metal.

Geochemistry: Olivine: Fa17.5±4.8 (Fa5.7-22.3; Cr2O3=0.6-0.8 wt.%; Fe/Mn=35, n=21). Pyroxene: Fs14-18Wo5 (n=14). Kamacite: Ni=3.9, Co=0.5, Si wt.% (n=4).

Classification: Ureilite

full slice 54 x 48 x 3.5 mm

scale cube is 1 x 1 x 1 cm
International meteorite collector association member number #3503