Physics
Scientific paper
Jun 1966
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1966gecoa..30..607b&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 30, Issue 6, pp.607-612
Physics
Scientific paper
Thirteen hollow australites, 1.15-3.25 cm in diameter, range in weight from 0.717 to 12.539 g. Most are weathered by abrasion and/or by natural solution etching, but the internal cavity remains intact in each specimen. The volumes of the internal cavities range from 0.002 cm 3 in the smallest form, to 4.0 cm 3 in the largest form, and the specific gravity values of the hollow specimens range from 2.420 in the second smallest form to 1.357 in the largest form. Although specific gravity values generally decrease towards the larger, heavier specimens with their usually larger internal cavities, specimens in the 2.2-5.8 g weight range show slight departures from this trend according to the size of the internal cavity relative to the amount of enclosing tektite glass. Thus, specimens of similar weight and size do not always have internal cavities of similar size, and a somewhat larger specimen does not always have a larger internal cavity than a somewhat smaller specimen. To remain as unbroken hollow forms these specimens have survived the effects of aerodynamic heating at high speed entry through the earth's atmosphere, resisted breakage on impact, and withstood weathering by abrasion and terrestrial solution etching.
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