Chemical Composition: an Igneous Silica (volcanic glass)
Occurence: Obsidian occurs in volcanic lava flows, from silica-rich magma that has come to the surface.
Obsidian is volcanic glass, and the "snowflakes" are the mineral phenocryst.
Metaphysical Properties: Discernment. Actualization. Sensitivity. Stone of purity and balance. Good for use in meditation.
Corresponding Astrological sign: Virgo
Corresponding Chakra: Root