资料来源 : pyDict

松脂石; 松脂岩

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Pitchstone \Pitch"stone`\, n. (Geol.)
   An igneous rock of semiglassy nature, having a luster like
   pitch.

资料来源 : WordNet®

pitchstone
     n : dark acid granitic glass