About Boulder Opals
Boulder opal (natural type 2 opal) - is found in a Large area in Queensland Australia from Longreach down to Quilpie Winton and Yowah. It is different to all other Australian opal as it has an iron stone as host stone. The precious opal or colour bar is usually so thin, that the opal cutter has to keep some of the iron stone to cut an opal. Because of the thin colour bar, many boulder opals are flat stones. Without much of a dome. Boulder opal gets its name from the way it is mined. It comes up in big boulders of iron stone, with vanes of colour through it. Other type of boulder opal is Yowah nuts.