Obsidian is a dark, shiny, jet-black volcanic glass that is formed when lava cools rapidly. This natural glass is known for its smooth texture, sharp edges, and reflective surface. Historically, obsidian was used by early civilizations for creating sharp cutting tools, weapons, and even mirrors due to its sharpness and polishability. Today, obsidian is used in jewelry-making and as a decorative stone in sculptures and architecture. Its unique appearance and deep black color make it a popular choice for those seeking a bold and striking aesthetic in their decor or accessories.