pitch-stone

pitchstone

[pich-stohn]
noun
a glassy volcanic rock having a resinous luster and resembling hardened pitch.

Origin:
1775–85; translation of German Pechstein. See pitch2, stone

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World English Dictionary
pitchstone (ˈpɪtʃˌstəʊn)
 
n
a dark glassy acid volcanic rock similar in composition to granite, usually intruded as dykes, sills, etc
 
[C18: translation of German Pechstein]

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