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  • Pitchstone - Wikipedia
    Pitchstone is a dark coloured, glassy volcanic rock formed when felsic lava or magma cools quickly Since it is a volcanic glass, pitchstone may have a conchoidal fracture
  • Pitchstone | volcanic, igneous, obsidian | Britannica
    pitchstone, a volcanic glass with a conchoidal fracture (like glass), a resinous lustre, and a variable composition Its colour may be mottled, streaked, or uniform brown, red, green, gray, or black It is formed by the rapid cooling of viscous lava or magma
  • Pitchstone - ALEX STREKEISEN
    Pitchstone is a dull black glassy volcanic rock formed when felsic lava or magma cools quickly It is similar to obsidian but is defined by the International Union of Geological Sciences as having a higher water content
  • Pitchstone - grokipedia. com
    Pitchstone is a glassy volcanic rock formed by the rapid cooling of silica-rich felsic magma or lava, characterized by its high water content—typically exceeding 5% H₂O—and a dull, resinous luster resembling broken pitch
  • Pitchstone: Mineral information, data and localities.
    Glassy silicic igneous rocks lacking a conchoidal fracture A dark, resinous volcanic glass
  • Pitchstone - Encyclopedia
    PITCHSTONE (German Pechstein, from its resemblance to pitch), in petrology, a glassy igneous rock having a resinous lustre and breaking with a hollow or conchoidal fracture
  • How to Identify Pitchstone | Properties, Meaning Uses
    Pitchstone is a glassy volcanic rock, similar to obsidian, but duller and with somewhat waxy luster due to its high water content The material is found only in Colorado, USA, and on Arran Island, which is off the coast of Scotland
  • Yellowstone | U. S. Geological Survey - USGS. gov
    Two of the eruptions are considered some of the world's largest volcanic events Yellowstone's youngest eruptions have been lava flows that remain confined to the caldera of present-day Yellowstone National Park The 77,000 year-old Pitchstone Plateau flow is the volcano's most recent lava
  • PITCHSTONE
    What's Pitchstone's story? What books are in the works?
  • PITCHSTONE Definition Meaning - Merriam-Webster
    The meaning of PITCHSTONE is a glassy rock that has a resinous luster and that contains more water than obsidian does





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