Australian Boulder Opal 4mm Round - 15-16 Inch Stone Type_Turritella Agate depositing copper and other elements

depositing copper and other elements that gradually develop into turquoise

red or orange body color

It is a particularly unusual gem because it exhibits a special optical property known as "tenebrescence

destruction

Australian Boulder Opal 4mm Round - 15-16 Inch Stone Type_Turritella Agate depositing copper and other elementsBoulder Opal is a golden brown to dark brown stone, displaying these colors in patterns of parallel bands. It is considered a precious Opal, and forms within a host rock such as ironstone or sandstone. Boulder Opal is believed to help with spiritual development, as well as with reconciling conscious and unconscious thought.