Common opal is a type of opal that does not display the vibrant play-of-color seen in precious opal. It is typically opaque or translucent and can come in various colors, including white, gray, and brown. Common opal is often used in jewelry and decorative items due to its unique appearance and affordability. Unlike precious opal, which contains a structured arrangement of silica spheres that create its colorful effects, common opal lacks this internal structure. This makes it less valuable but still popular among collectors and artisans. Common opal can also be found in various locations around the world, including Australia, Mexico, and the United States.