It is an igneous rock
obsidian
!I think there is quarts, but I only think.
Obsidian is an igneous rock.
Obsidian is in the Igneous rock group.
No. Obsidian is volcanic glass. Glass is amorphous and thus noncrystalline.
Volcanic rock.
No. Obsidian is just one of many types of volcanic rock.
Obsidian is an extrusive felsic igneous rock.
The common name for obsidian rock is volcanic glass.
obsidian obsidian
obsidian
Obsidian is in the Igneous rock group.