volcanic glass

2 definitions found

volcanic glass - Collaborative International Dictionary of English v.0.48 :

  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 affected by the heat of a volcano.
        [1913 Webster]
  
     Volcanic bomb, a mass ejected from a volcano, often of
        molten lava having a rounded form.
  
     Volcanic cone, a hill, conical in form, built up of
        cinders, tufa, or lava, during volcanic eruptions.
  
     Volcanic foci, the subterranean centers of volcanic action;
        the points beneath volcanoes where the causes producing
        volcanic phenomena are most active.
  
     Volcanic glass, the vitreous form of lava, produced by
        sudden cooling; obsidian. See Obsidian.
  
     Volcanic mud, fetid, sulphurous mud discharged by a
        volcano.
  
     Volcanic rocks, rocks which have been produced from the
        discharges of volcanic matter, as the various kinds of
        basalt, trachyte, scoria, obsidian, etc., whether compact,
        scoriaceous, or vitreous.
        [1913 Webster]

volcanic glass - WordNet (r) 2.1 (2005) :

  volcanic glass
      n 1: a kind of natural glass produced when molten lava cools
           very rapidly