felsite
felsite A very light-coloured, aphanitic igneous rock, with or without phenocrysts present. The term is used in the field as an initial classification and can refer to devitrified rhyolite glass (obsidian), or primary, cryptocrystalline rhyolite.
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Earliest Times
The earliest manufacture of glass does not antedate the late third millennium b.c.e., when the first glass beads were made in Me…
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felsite