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perlite - screened and partially dried perlite pellets and popped perl – Geological Specimen Supply

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Perlite is a hydrated form of obsidian. When a mass of obsidian picks up water, it devitrifies and becomes amorphous perlite. The unhydrated core of the obsidian mass may weather out as an obsidian spherule called an Apache Tear.  Perlite can also form by the sudden cooling and solidification of rhyolitic volcanic ash

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Perlite is a hydrated form of obsidian. When a mass of obsidian picks up water, it devitrifies and becomes amorphous

perlite - screened and partially dried perlite pellets and popped perlite - set of two 2-ounce jars - Geological Specimen Supply

Crushed & screened perlite (Hollinger Quarry, Wilson Creek…

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