Obsidian: Volcanic Glass with Sharp Edges - Uses, History, and Properties

Obsidian is a naturally occurring volcanic glass formed when lava cools rapidly. It is typically black in color, although it can also occur in shades of brown, green, or red. Obsidian has a smooth, glassy texture and is known for its sharp edges, making it useful for tools and weapons in ancient times. It has been used by humans for thousands of years for making arrowheads, knives, and other cutting tools. In addition, obsidian is also used in jewelry and as a decorative stone. It is found in various parts of the world, including North America, Europe, and Asia.