Obsidian is a naturally occurring volcanic form of glass.
Obsidian.
Obsidian
hard rock
obsidian
Vitreous (glassy)
Obsidian
obsidian
Pumice, an igneous rock, is generally white to dark gray.
Volcanic glass or obsidian.
Obsidian.
Vitreous (glassy)
Obsidian is a glassy rock formed from rapid cooling of acidic magma.
An igneous rock with a glassy texture cooled from its' liquid state very quickly, an example of this would be obsidian, a volcanic glass.
Obsidian is an extrusive rock that cooled very rapidly without forming crystals. As a result, obsidian has a smooth, shiny texture of a thick piece of glass.
a rock
Obsidian
obsidian
feldspar
The answer is pitchstone. it is and igneous rock.
an odsidian rock is black,shiny and kinda glassy.
Pumice.