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History
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Expanded perlite.
Expanded perlite.
Perlite boulders with fireweed in foreground
Perlite boulders with fireweed in foreground
Perlite mine in Owens Valley, California.
Perlite mine in Owens Valley, California.
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Obsidian
Obsidian
Obsidian talus at Obsidian Dome, California
Obsidian talus at Obsidian Dome, California
Polished snowflake obsidian, formed through the inclusion of cristobalite crystals
Polished snowflake obsidian, formed through the inclusion of cristobalite crystals
Glass Mountain, a large obsidian flow at Medicine Lake Volcano in California
Glass Mountain, a large obsidian flow at Medicine Lake Volcano in California