Obsidian and Sterling silver Pendant

Obsidian was used by American Indians and many other primitive peoples for weapons, implements, tools, and ornaments and by the ancient Aztecs and Greeks for mirrors. Obsidian in attractive and variegated colours is sometimes used as a semiprecious stone.obsidian, natural glass of volcanic origin that is formed by the rapid cooling of viscous lava. Though obsidian is typically jet-black in colour, the presence of hematite (iron oxide) produces red and brown varieties.