volcanic glass
noun Date: circa 1840 natural glass produced by the cooling of molten lava too rapidly to permit crystallization

New Collegiate Dictionary. 2001.

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  • Volcanic glass — Volcanic Vol*can ic, a. [Cf. F. volcanique, It. vulcanico.] 1. Of or pertaining to a volcano or volcanoes; as, volcanic heat. [1913 Webster] 2. Produced by a volcano, or, more generally, by igneous agencies; as, volcanic tufa. [1913 Webster] 3.… …   The Collaborative International Dictionary of English

  • volcanic glass — n. natural glass, as obsidian, formed by the very rapid cooling of molten lava …   English World dictionary

  • Volcanic glass — A sand grain of volcanic glass under the petrographic microscope. Its amorphous nature makes it go extinct in cross polarized light (bottom frame). Scale box in millimeters. Volcanic glass is the amorphous (uncrystallized) product of rapidly… …   Wikipedia

  • volcanic glass — a natural glass produced when molten lava cools very rapidly; obsidian. [1830 40] * * * Any glassy rock formed from lava or magma that has a chemical composition close to that of granite. Such molten material may reach very low temperatures… …   Universalium

  • volcanic glass — noun a kind of natural glass produced when molten lava cools very rapidly • Hypernyms: ↑volcanic rock • Hyponyms: ↑obsidian, ↑pitchstone, ↑tachylite …   Useful english dictionary

  • volcanic glass — volcan′ic glass′ n. gel a natural glass produced when molten lava cools very rapidly; obsidian • Etymology: 1830–40 …   From formal English to slang

  • volcanic glass — /vɒlkænɪk ˈglas/ (say volkanik glahs) noun a natural glass produced when molten lava cools very rapidly; obsidian …   Australian English dictionary

  • volcanic glass — noun another term for obsidian …   English new terms dictionary

  • Volcanic ash — consists of small tephra, which are bits of pulverized rock and glass created by volcanic eruptions,United States Geological Survey. [http://volcanoes.usgs.gov/Hazards/What/Tephra/tephra.html Tephra: Volcanic Rock and Glass Fragments.] Retrieved… …   Wikipedia

  • Volcanic — Vol*can ic, a. [Cf. F. volcanique, It. vulcanico.] 1. Of or pertaining to a volcano or volcanoes; as, volcanic heat. [1913 Webster] 2. Produced by a volcano, or, more generally, by igneous agencies; as, volcanic tufa. [1913 Webster] 3. Changed or …   The Collaborative International Dictionary of English

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