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.
Obsidian is an extrusive felsic igneous rock.
Volcanic rock and obsidian.
No. Obsidian is just one of many types of volcanic rock.
Volcanic glass, or pumice (vesicular obsidian).
obsidian obsidian
obsidian
Obsidian is in the Igneous rock group.