Pitchstone
id:
pitchstone-199-16080621
title:
Pitchstone
text:
Pitchstone is a dark coloured, glassy volcanic rock formed when felsic lava or magma cools quickly. Since it is a volcanic glass, pitchstone may have a conchoidal fracture. Pitchstones may also contain phenocrysts, in which case it is a form of vitrophyre. Pitchstone has a resinous lustre, or silky in some cases, and a variable composition. Its colour may be mottled, streaked, or uniform brown, red, green, gray, or black. It is an extrusive rock that is very resistant to erosion. The pitchstone
brand slug:
wiki
category slug:
encyclopedia
description:
Volcanic rock
original url:
https://en.wikipedia.org/wiki/Pitchstone
date created:
date modified:
2024-04-02T19:17:53Z
main entity:
{"identifier":"Q1423205","url":"https://www.wikidata.org/entity/Q1423205"}
image:
{"content_url":"https://upload.wikimedia.org/wikipedia/commons/e/e3/The_%22Nose%22%2C_An_Sgurr%2C_Isle_of_Eigg_-_geograph.org.uk_-_16774.jpg","width":400,"height":600}
fields total:
13
integrity:
15