pitchstone

from WordNet (r) 3.0 (2006)
pitchstone
    n 1: dark acid granitic glass
from The Collaborative International Dictionary of English v.0.48
Pitchstone \Pitch"stone`\, n. (Geol.)
   An igneous rock of semiglassy nature, having a luster like
   pitch.
   [1913 Webster]
antiflux / dictionary / pitchstone
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