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microtektite
microtektite n.
Brit. 
/ˌmʌɪkrə(ʊ)ˈtɛktʌɪt/
, /ˌmʌɪkrə(ʊ)ˈtɛktʌɪt/U.S. /ˌmaɪkroʊˈtɛkˌtaɪt/
/ˌmaɪkroʊˈtɛkˌtaɪt/ΚΠ
1967 Nature 22 Apr. 374/1 It is concluded that the glassy objects [in deep-sea sediments] discussed in this report are microtektites, and that they constitute a portion of the Australasian strewn field which extends from Thailand to Tasmania.
1992 New Scientist 8 Aug. 15/2 He found microscopic glass beads, or microtektites, in samples he etched with acid while looking for microfossils.
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