TOP BOULDER OPAL ROUGH PARCEL
Check out this outstanding Top Boulder Opal Rough Parcel. An extra quality parcel of beautiful rough Boulder Opal. These are the best specimens out of several lots bought in person directly from the dude that mined it! Unusual and vibrant aqua colouring is a feature of this lot, along with blue, green sparkles and other flashes of colour. Some pieces show the veining which is an attractive feature also. Each piece has been cut to its best potential ready for jewellery or perfect as a mineral specimen in your Aussie collection. I feel like this one is a parcel I’ll regret selling, but that’s the way it goes in the rock trade. I love opal in the rough and this is a special little parcel on offer. Most photos taken wet, none do justice to this lot, which looks better in person. Boulder Opal is found only in Australia, making it rare gem indeed. Enjoy!
7 Pieces, 114g.
nH2O Hydrated Silicon Dioxide.
Boulder Opal Precious Opal found in Queensland, Australia. Found as cracks or coatings in and around ironstone/sandstone boulders. Opal has been a popular gem for many centuries and has a very interesting structure. The name Opal, derived from the Sanskrit name for precious stone upala.
Opal, considered a mineraloid because this structure is not truly crystalline. 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.