Boulder opal is a captivating Gemstone that forms within ironstone or Sandstone boulders,primarly found in Queensland Australia.
Boulder opal develops in thin layers of ironstone or Sandstone . These veins contain tiny sheres of silica gel that diffract light creating enchanting play of colour right through the spectrum, the presence of the host rock provides stability for the delicate Opal layers resulting in a unique appearance. It's mined from large ironstone boulders deep underground making it rarer than other Opals . High quality Boulder Opals with vibrant colours and patterns is particularly valuable. Collecting Specimans of Boulder Opal is popular showcasing all the variations and types & also for educational & Historical purposes amongst Geoligist & collectors alike or simply just to own a peice of this captivating Gemstone Boulder all the way from the Australian outback.