Meteorite Recon | Grein 005
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5919
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Grein 005

Iron, octahedrite, IIIAB
Erg du Ténéré, Agadez district, Republic of Niger
Find: November 2015
TKW: 52.5 kg
Partslice: 272 g

History: Found in November 2015 exposed on the surface by artisanal miners while prospecting for gold between Tehmet and Djado in the Tènéré Tafassasset. Click here for full find documention and report of associated masses.

Physical characteristics: The 52 kg mass is 39 × 25 × 18 cm and has the shape of a longitudinally split cone with the cone section showing minor concavity while the opposite surface is distinctly convex. Numerous regmaglypts measuring 1-3 cm across and 1-1.5 cm deep are present, and at least one troilite inclusion is observed. The specimen is coated with a thick layer of dark brown desert varnish.

Petrography: Polished sections display a well-developed Widmannstätten pattern of a medium octahedrite with a mean kamacite bandwidth of 1.0±0.2 mm. Neumann bands are visible within kamacite. Schreibersite and graphite are absent in the sections observed. Troilite is present in the form of rounded and bar-shaped inclusions ranging from 2-20 mm across the longest axis, partly surrounded by thin swathing kamacite. Fractures up to 1 mm wide penetrate the meteorite along the kamacite lamellae and are filled with terrestrial oxides, otherwise the interior weathering is very moderate. Fusion crust and heat-affected zones are mostly absent.

This is partslice of 272 g, polished and etched on one side.

Inventory #

B-470.2

Date

May 19, 2017

Category

Finds, Irons