Impossible to say, not knowing the definition of plain regular rock.
There are some rocks harder than obsidian, while many are softer.
If a rock gains enough heat and then is cooled suddenly enough it turns into obsidian,
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.
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obsidian
Obsidian is in the Igneous rock group.
Obsidian is an igneous rock.So the answer is YES.