volcanic rock
random
If you grab too tightly, you get zapped with instant enlightenment.
rock of
volcano
tagged
andesite
obsidian
tags
igneous rock
rock
Wikidata
https://www.wikidata.org/wiki/Q108689
Wikimedia
https://commons.wikimedia.org/wiki/Category:Volcanic_rocks
Wikipedia
https://en.wikipedia.org/wiki/Volcanic_rock