ALL meanings of pitchstone
pitch·stone
P p - noun pitchstone a glassy volcanic rock having a resinous luster and resembling hardened pitch. 1
- noun pitchstone a dark glassy acid volcanic rock similar in composition to granite, usually intruded as dykes, sills, etc 0
- noun pitchstone a volcanic glass that somewhat resembles pitch and has a higher percentage of water than obsidian or other glassy rocks 0