Obsidian

Obsidian is not a mineral crystal but natural volcanic glass, usually formed by rapid cooling of silica-rich lava. Without a crystal lattice, composition and appearance vary by source. Names such as snowflake, mahogany and rainbow describe appearances; not every piece of black glass is obsidian.

Obsidian’s history begins with a sharp edge before it becomes a polished jewel. Conchoidal fracture made it useful for flakes, knives and projectile points; the same glossy black surface became a mirror when polished. This duality—cutting edge and reflecting face—also shapes modern symbolism.

In spiritual use, meaning is a layer distinct from mineral properties but still open to cultural study. Spiritual practice links obsidian with shadow work, boundaries and seeing what has been concealed. Its glossy black surface is read as a mirror, while its sharp fracture suggests that truth may separate before it comforts. It is therefore a symbol of directness rather than a uniformly soothing stone.

Sources: 1, 2, 3.