Brazilian Opal is mined in the North East region of the state of Piaua, where there are no large-scale Opal fields and the only equipment used is a generator. Many Brazilian Opals are found in a quarry at the foot of a sandstone cliff and are hand-dug.
Brazil produces beautiful Crystal Opal with unusual pastel fire colours. It is a hardy Opal because it has low moisture content compared to other Opals.
One of the most important mines is Boi Morto where Opal found is mostly associate within the clay bands.
Brazilian Opal has tended to be white semi-transparent to see-through body tone. Though a Boi Morto vein obtained a small amount of black opal a few decades ago. The largest Opal found in Brazil weighed an astonishing 4.3 kg.
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 that the dominant rock is sandstone and siltstones.
One of our Verified sellers has opal mine in Horca area in Brazil
Marc from Opalbrazil has beautiful natural opals from his opal mine in Horca region of Brazil
It is different scenery compared to Australia desert conditions and the green vegetation and heaps of water are completely different to dry dusty conditions in the Australia outback.
Brazilian opals are unique in themselves and so different to Australian or Ethiopian Opals
Unfortunately, production is low so not much marketing so many opal buyers are not aware of the stunning crystal opals from brazil
In late 1980s this mine hit massive pocket of opals but since than it is harder and rare to find good opals
During the latest years, a significant existence of precious Opal in Piaui State of north-eastern Brazil has been developed. The significant area is in the area of the city of Pedro Secundo, or Pedro II. In fact, Jobbins analyzed these deposits for the Brazilian administration and has stated on them in some aspect. He noted that four kinds of incident may be identified in the following aspect:
-Some Brazilian deposits where the Opal is in place for the configuration of veins and levels, close to the intersection of sandstone, or in the soil in sorting them.
-These deposits were discovered in the soil or weathered outline directly beyond the source and have not enthused imaginatively.
-These deposits are usually found on a valley hill between source and nearby river valley floors.
Opals that are found from all places in the world are usually found to enclose with only 5% - 6% water compared with other locations enclosing from 10% -12% of water. The significance of this is that the Brazilian opal is a lower possibly to crack due to the exposure of heat or sunlight. It has also been noted that Brazilian Opal is somewhat tough compared with other opals that are usually used in producing jewellery.
Was this article helpful?9 people found this article helpful