Gaia Stone is green obsidian from volcanish ash of the eruption of Mt. St. Helen's, and carries strong Earth energy, even the "soul of the Earth." Gaia Stone enhances Goddess connection, connection with Earth and Earth devas. It also brings prosperity. Gaia Stone is especially good for self-healing emotional wounds and past traumas. Gaia Stone is primarily associated with the heart chakra, but can also be used to harmonize all the chakras. Please note that healing crystal meanings are spiritual supports to healing and are not prescriptions or healthcare information.
Most, if not all, Gaia stone is manufactured from the Mt. St. Helen's ash. I have heard of natural Gaia stone but can not confirm that was the case.