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  2. Volcanic glass - Wikipedia

    en.wikipedia.org/wiki/Volcanic_glass

    Volcanic glass is the amorphous (uncrystallized) product of rapidly cooling magma. Like all types of glass, it is a state of matter intermediate between the closely ...

  3. Obsidian - Wikipedia

    en.wikipedia.org/wiki/Obsidian

    Obsidian talus at Obsidian Dome, California Polished snowflake obsidian, formed through the inclusion of cristobalite crystals. The Natural History by the Roman writer Pliny the Elder includes a few sentences about a volcanic glass called obsidian (lapis obsidianus), discovered in Ethiopia by Obsidius, a Roman explorer.

  4. Tachylite - Wikipedia

    en.wikipedia.org/wiki/Tachylite

    Tachylite (/ ˈ t æ k ə l aɪ t / TAK-ə-lyte; also spelled tachylyte) is a form of basaltic volcanic glass. This glass is formed naturally by the rapid cooling of molten basalt. It is a type of mafic igneous rock that is decomposable by acids and readily fusible. [citation needed] The color is a black or dark-brown, and it has a greasy ...

  5. Perlite - Wikipedia

    en.wikipedia.org/wiki/Perlite

    Perlite is an amorphous volcanic glass that has a relatively high water content, typically formed by the hydration of obsidian. It occurs naturally and has the unusual property of greatly expanding when heated sufficiently.

  6. ‘Mystery volcano’ that erupted and cooled Earth in 1831 has ...

    www.aol.com/news/mystery-volcano-erupted-cooled...

    The study team also chemically analyzed ash and shards of volcanic glass measuring no more than 0.0008 inch (0.02 millimeter) long. When the scientists compared their results with geochemical ...

  7. Helenite - Wikipedia

    en.wikipedia.org/wiki/Helenite

    Helenite, also known as Mount St. Helens obsidian, emerald obsidianite, and ruby obsidianite, is a glass made from the fused volcanic rock dust from Mount St. Helens and marketed as a gemstone. [1] [2] Helenite was first created accidentally after the eruption of Mount St. Helens in 1980.

  8. Pele's hair - Wikipedia

    en.wikipedia.org/wiki/Pele's_hair

    Pele's hair, with a hand lens as scale Strands of Pele's hair under microscope view. Pele's hair (closest modern Hawaiian translation: "lauoho o Pele " [1]) is a volcanic glass formation produced from cooled lava stretched into thin strands, usually from lava fountains, lava cascades, or vigorous lava flows.

  9. List of rock types - Wikipedia

    en.wikipedia.org/wiki/List_of_rock_types

    Trachybasalt – Volcanic rock – A volcanic rock with a composition between basalt and trachyte Hawaiite – Volcanic rock – a sodic type of trachybasalt, typically formed by ocean island volcanism; Trachyte – Extrusive igneous rock – A silica-undersaturated volcanic rock; essentially a feldspathoid-bearing rhyolite

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