pitchstone
Concise Oxford English Dictionary © 2008 Oxford University Press:
pitchstone/ˈpɪtʃstəʊn/
▶noun Geology a dull vitreous rock resembling hardened pitch, formed by weathering of obsidian.
'pitchstone' also found in these Oxford entries:
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pitchstoneConcise Oxford English Dictionary © 2008 Oxford University Press: pitchstone/ˈpɪtʃstəʊn/ ▶noun Geology a dull vitreous rock resembling hardened pitch, formed by weathering of obsidian. 'pitchstone' also found in these Oxford entries:
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