BOULDER OPAL POLISHED PARCEL 4
Boulder Opal Polished Parcel 4. Opals in green, blue, orange, purple a rainbow of colors in the parcel. Ready for jewellery making or as specimens. A collection with great variety of colour and Queensland locations cut and polished by local Sydney Opal Cutter. This lot of polished are from Boulder Opal gemstone. Photos are with dry stones outside. This is a mixed parcel of Boulder Opal from various locations in Queensland. These lots are popular as always at a bargain price.
My photos do no justice to many of these polished Opals, in real life with natural light they look much better with sharper colors. Some have letters on the back for an indication of locations within Queensland. We have taken pics of both sides of the Opals shown on the black background.
4 Pieces, 15.85g.
Blue Green 3.3cm x 1.9cm x 0.7cm, 8.11g.
Purple 1.3cm x 1.9cm x 0.4cm, 1.64g.
Blue Green 3.1cm x 1.5cm x 0.5cm, 3.51g.
Orange 2.4cm x 1.4cm x 0.5cm, 2.58g.
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.