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pitchstone

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pitch·stone  (pchstn)
n.
Any of various volcanic glasses distinguished by their dull pitchlike luster.
[Translation of German Pechstein.]
pitchstone [ˈpɪtʃˌstəʊn]
n
(Earth Sciences / Geological Science) a dark glassy acid volcanic rock similar in composition to granite, usually intruded as dykes, sills, etc.
[translation of German Pechstein]
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.pitchstone - dark acid granitic glass
volcanic glass - a kind of natural glass produced when molten lava cools very rapidly
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As the years - rather a lot of them - passed, the softer basalt eroded but the pitchstone stayed; hence this massive astonishing lump.
Conquering the last great wilderness by guardian.co.uk / guardian.co.uk
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Levine Pitchstone Publishing Charlottesville, Virginia 22901 0972887547 $24.
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