Brazilian Opals are mined in the northeast region of the state of Piaua. Many are found in a quarry at the foot of a sandstone cliff and are hand-dug.
There are no large-scale opal fields, and the only equipment used is a generator. Most opals are good fire Brazilian crystal opal.
Brazilian opals are known as semi translucent to white translucent and have less water composition than Australian opals.
Australian opals have on average less than 10% water composition but Brazilian opals on average have less than 5% water
Brazilian opals forms in veins or layers of opals color and…