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Obsidian cores and blades were traded great distances inland from the coast.Obsidian was used to inscribe the Rongorongo glyphs.The inhibition of atomic diffusion through this highly viscous and polymerized lava explains the lack of crystal growth.

Similar tracing techniques have allowed obsidian to be identified in Greece also as coming from Milos, Nisyros or Gyali, islands in the Aegean Sea.

"Apache tears" are small rounded obsidian nuggets often embedded within a grayish-white perlite matrix.

Plinths for audio turntables have been made of obsidian since the 1970s; e.g.

Obsidian may contain patterns of gas bubbles remaining from the lava flow, aligned along layers created as the molten rock was flowing before being cooled.

These bubbles can produce interesting effects such as a golden sheen (sheen obsidian).