A dull vitreous rock resembling hardened pitch, formed by weathering of obsidian.
〔地质〕松脂石
Example sentencesExamples
Also found was a flake of green Arran pitchstone, thought to be a waste fragment from the manufacture of a tool.
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.
Definition of pitchstone in US English:
pitchstone
nounˈpiCHˌstōn
Geology
A dull vitreous rock resembling hardened pitch, formed by weathering of obsidian.
〔地质〕松脂石
Example sentencesExamples
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.