The geological definition of obsidian is volcanic glass; that is…glass created by volcanism that forms when molten rock material cools.
Human hands have nothing to do with it.
Although Gaia Stone is sometimes referred to as The Goddess Stone, Blue Obsidian, Green Obsidian, or St. Helens Obsidian, IT IS NOT OBSIDIAN.
If Mother Earth didn’t fuse it together during a volcanic eruption herself…then it isn’t obsidian.