The Boulder Opal which is often referred to as the Matrix Opalis is an alluring gemstone. Its origin, since it is discovered embedded in ironstone boulders, gives it its name. The reason matrix opal gets its name is that it fills in the fissures and gaps inside ironstone matrix rock to make an unusual and exquisite pattern. This stunning multicolored stone frequently features bursts of vivid hues like green, blue, and red over a background that is brownish or greyish. This results in this stone’s magnificent and distinctive beauty. The Australian state of Queensland’s outback is a common source of boulder opal.