BOULDER OPAL SPLIT
A Boulder Opal Split for collection or jewellery making. A large sized Opal specimen in Blue and a splash of Orange colour. A really lovely pair of Aussie stones. This specimen is from quality Boulder Opal gemstone. You can see two good seams split and a little on the side. Pics are taken with dry stone outside. Great fro display and great colour. There are other seams and crevices of opal through both rock halves. These lots are popular as always at a bargain price and great investment.
8.8cm x 7.2cm x 10.9cm, 765g.
Hydrated Silicon Dioxide.
Opal has been a popular gem for many centuries and has a very interesting structure. The name opal comes from the Sanskrit name for precious stone upala. Opal structure is not crystalline and considered a mineraloid. The chemistry of Opal is primarily SiO2 and varying amounts of water. The amount of water varies from 5 -10% and greater. This water can help geologists determine the temperature of the host rock at the time the opal formed.