tektite
Stato: Indonesia Anno: 1999 Notizie: In 1999 Indonesia issued a tektite stamp as part of a series on minerals. Tektites are a type of impact glass formed during large impact events. The force of the meteorite impact melts sandstone into glass and lifts it outside the Earth's atmosphere. As the glass drops rain back to Earth, their passage through the atmosphere shapes them into a variety of forms such as spheres, cylinders, dumbbells, and buttons. These glassy drops eventually cool and solidify into tektites. A few scientists still believe that at least some tektites were formed in lunar volcanic eruptions and ejected to Earth by the force of the eruptions. |
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