Definition of pitchstone in English:

pitchstone

Line breaks: pitch|stone
Pronunciation: /ˈpɪtʃstəʊn
 
/

noun

[mass noun] Geology
  • A dull vitreous rock resembling hardened pitch, formed by weathering of obsidian.
    More example sentences
    • This feature was once described as ‘the finest ‘small’ mountain feature in the British Isles ’, and is in reality an east-west ridge of volcanic rock which appears as a narrow upthrust of columnar pitchstone when seen from the south or east.
    • Similarly, Arran pitchstone has turned up in Ireland and Orkney, highlighting the complex exchange networks between these places.
    • Also found was a flake of green Arran pitchstone, thought to be a waste fragment from the manufacture of a tool.

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