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Post Info TOPIC: Mayo Belwa meteorite


L

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RE: Mayo Belwa meteorite
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A fireball was seen by herdsmen and sounds were heard over an area extending to 25 km from the impact site. The stone was sent to the Geological Survey of Nigeria and smelt strongly of sulphur when first received.
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Title: METAL AND SCHREIBERSITE IN MAYO BELWA, AN ENSTATITE ACHONDRITE
Authors: A.L. Graham

The Mayo Belwa meteorite (an aubrite) contains discrete metal grains ranging in size from less than 1 m to 300 m across, and schreibersites up to 25 m across. Intergrowths of metal and schreibersite also occur. These phases are distributed heterogeneously throughout the meteorite and are present both in the fine-grained matrix and within silicate crystals. The concentrations of the elements Ni, Fe, Si, Co, P, were determined in grains larger than 4 m across. Most metal grains have 1-8% Ni, the total range being 0.8-23.5% Ni. The 1-8% Ni metal may be sub-divided into two compositional groups, one relatively compact, having 1-3.8% Ni, 0.1-0.3% Si; the second having a much greater range in both Ni and Si (~4-12%, 0.1-1.2% respectively).

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The Mayo Belwa (Aubrite) meteorite fell in Adamawa, Nigeria, on the 3rd August, 1974.
A total mass of 4.85 kg was recovered.

8° 58'N, 12° 5'E



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