The abundance of nickel in some natural glasses

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Scientific paper

The nickel content of four australites, one billitonite, two meteorite impact glasses, and three obsidians have been determined by neutron activation analysis. The iron contents of these specimens have been determined by gravimetric techniques and nickel to iron weight ratios tabulated. On the basis of this ratio, the tektites form a group that is distinct from both the obsidians and the meteorite impact glasses. This is consistent with previous analyses on other specimens of each of these types. The nickel to iron ratio was found to be virtually constant for australites distributed geographically over a range of more than 1000 miles. The nickel content for the billitonite specimen analysed was found to be much lower than previously reported for this occurrence. It is suggested that tektites from Billiton may represent two overlapping occurrences, similar to the Indochina tektites. Implications of the data to the origin of tektites are discussed.

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