Beauty images, for you
Rocks
OPAL
The most beautiful and the most expensive rocks
Image source: opel.shoutwiki.com
An opal is a mineral composed of hydrated silica (…), with traces of uranium, magnesium, calcium, aluminum, iron, arsenic, sodium and potassium. The water content is usually between 3 and 9%; it can reach 20% depending on the variety (…)
It is made up of three very distinct mineral species:
cristobalite; Tridymitis; Hydrated amorphous silica. [Wikipedia]
Image source : opel.shoutwiki.com
The most famous but also the most expensive Opals are black Opals. These are truly sumptuous and collectors are snapping them up. The finest speciements from Australia can have prices in excess of $ 24,000.
Image source : flickr / James St. John
Olympic opal Australis is the name of the world’s most expensive massive 3.45 kg (7.6 lbs) opal found in the Coober Pedy in 1956, valued at $ 2.5 million in 2005 .(I did not find a free photo of this opal, Sorry)
Image source : commons.wikimedia / James St. John
See 5 more images of the beautiful opals here
Title image source: perierga.gr
beautiful indeed.