Brazil produces beautiful Crystal Opal with unusual pastel fire colors. It is a hardy Opal because it has low moisture content compared to other Opals.
Brazilian Opal forms in veins or layers of Opals and in alluvial deposits that has been washed down by rivers over centuries or mined on slopes between source and present river floors. Australian Opals forms as nobbies or in seams but Brazilian Opal has been formed differently in dominant rock of sandstone and silt stones.