BOULDER OPAL BLURPLE
A Boulder Opal Blurple colour for collection or jewellery making. Opal specimen in Purple, Blue and a hint of Green. Yep that’s a new name for the colour of Blue and Purple mix. A really lovely Aussie stone. This specimen is a quality Boulder Opal gemstone.
2.5cm x 1.9cm x 0.6cm, 5.11g.
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.