BOULDER OPAL POLISHED
Here we have a Boulder Opal Polished specimen that is ready to be set in jewellery. This is a solid piece of Opal with great shimmery blue green colouring. Treat yourself to an affordable piece of genuine Australian Opal from Queensland.
3.0cm x 2.9cm x 0.7cm, 6.65g.
nH2O 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.