Those are skin splits, not contacts. Its surface had cooled to form a
skin, interior was still molten / plastic. See Nininger & Huss (1967):
https://www.science.org/doi/abs/10.1126/science.157.3784.61
http://www.tektites.co.uk/stretch.html
On Mon, Mar 13, 2023 at 9:19 AM Thomas Harris iMac
I always enjoy the irregular shapes in tektites because the standard dumbbells,
teardrops and spheroids are exactly that, standard.
This is a 5 cm irregular or fragment-form Australasian tektite from Viet Nam
with what appears to have smeared indentations from low speed contact(s),
presumedly
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