Definition of pitchstone in English:

pitchstone

Syllabification: pitch·stone
Pronunciation: /ˈpiCHˌstōn
 
/

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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