Buy Brazilian Opal from opal miners direct. This opal has good reputation and has tended to be white semi-transparent to see-through body tone. And is considered very stable a s less water content than other opal fields
Also known as brazilin crystal opal ,or Brazilian Pedro Segundo opal , it can display beautiful veins colour lines and freeform shapes that have thick colour bars can be carved or polished undulating form. Some colours are magical patterns called rainbow and patterns display skintoskin which refers to colour within the whole opal. This is another reason freeform shapes are popular with jewellers to create a unique jewelry design a s not many opal fields have colour on both sides a s these Brazilian opals do.
Though a Boi Morto vein obtained a small amount of black opal a few decades ago,but is rare to find a black brazilan opal unless from old collection..
The largest Opal found in Brazil weighed an astonishing 4.3 kg. there are not many mining operations now as the sandstone bedrock takes lot work to shift and opal appears to occur as veins in a quarzitic sandstone so is lot effort to find these opals and dig them up.
Some alluvial opal is found but this is only small proportion of opals found as the easy to find opals have been found and hard to find new alluvial deposits as they are only small pockets.
Rough Feldspar opal specimens is minerals distinguished by the presence of alumina and silica and therefore classified a s opal as silica is impregnated into bedrock feldspar