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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 Pitchstones may also contain phenocrysts, in which case it is a form of vitrophyre Pitchstone has a resinous lustre, or silky in some cases, and a variable composition Its
  • 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 Technology
    Save time and reduce operational expenses by streamlining workflows and automating routine tasks—your way Make data-driven decisions that lead to better outcomes and increased profitability Ensure clear ownership and timely execution across your organization Gain real-time visibility into responsibilities, progress, and changes
  • Pitchstone: Mineral information, data and localities. - mindat. org
    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 It differs from obsidian principally in its rather dull lustre, for obsidian is bright and vitreous in appearance; all pitchstones also contain a considerable quantity of
  • Pitchstone - Rock Identifier
    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
  • Use-wear analyses and provenance determination of pitchstone artefacts . . .
    Pitchstone is a glassy acidic igneous rock formed by the rapid cooling of lava or magma It resembles obsidian in its chemical composition but differs in having a higher water content (typically 5–10% by weight), a duller (waxy) lustre and, often, an irregular or hackly fracture
  • 2014: Pitchstone: The poor cousin of obsidian? - Academia. edu
    Basically, apart from pitchstone’s higher water content, it is an obsidian (or at least a first cousin; see definitions above), and when discussing the extensive prehistoric obsidian exchange networks in the Old World as well as in the Americas, Scottish pitchstone may have a contribution to make
  • PITCHSTONE TECHNOLOGY, LLC in Seattle, WA - Bizapedia
    Discover Company Info on PITCHSTONE TECHNOLOGY, LLC in Seattle, WA, such as Contacts, Addresses, Reviews, and Registered Agent
  • 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





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