These stones may also be found in Honduras and the United States of America, where other more valuable varieties are reported to be plentiful.Ī Mexican fire opal, on the other hand, is different. While fire opals are mostly found in Australia, they are also mined at the Queretaro cast mines. The Fire Opal is a form of opal that has bright shades such as yellow, orange, and red. Many people get confused by the term ‘fire opal’ because there are actually a few different types of fire opal that are native to different regions of the world.įor this reason, it is a common error to confuse the Austrian Fire Opal with the precious opal, even though the two are extremely different from each other. Australian Fire Opal “Opalized fossil bivalve (Bulldog Shale, Lower Cretaceous Coober Pedy Opal Field, South Australia) 09” by James St.

SEE ALSO 7 Types of Geodes Rocks in the World 3. When this happens, the “split” leaves two opal faces, one that is naturally polished and the other that is not. Boulder opal also has a tendency to cleave. Most of the gem, therefore, is just the host rock while the opal itself is like a thin veil over the boulder.īoulder opals can be dark or bright in color, depending on how the host boulder appears when seen from the surface. This is especially true in the case of an ironstone boulder. The opal presents itself as in-fillings of fissures and voids in the boulder. The Boulder Opal usually forms around a host piece of rock (or boulder), which also naturally becomes a part of the gem. Instead, it is an opal-covered boulder or stone. This particular stone is usually not a completely solid opal gem. It is common in the Queensland area of the country. The Boulder Opal is another example of an Australian opal stone that is also mostly found in South Australia. Boulder Opal “ Boulder opal” by Dietmar Down Under is licensed under CC BY 2.0. This is occasionally referred to as “black body color.” The Black opal is a precious Australian opal native to Lightning Ridge, South Australia. The black opal is easily recognizable from other kinds of opals as the classic play of color pattern common to all opals is present on a black background. Instead, the black opal tends to have a black undertone to it. The naturally occurring black opal isn’t exactly a pure black stone as the common misconception about it seems to suggest. A Black Opal is one of the rarer, and also one of the most precious forms of opal that exists in the world today. No list of opals could ever be considered complete without mentioning the famous Black Opal sometimes also referred to as the Australian black opal.

The following is a collection of some of the most unique and precious opal stones on the planet. That, or, of course, it could be the tears of joy Zeus wept after winning against the Titans that helped form the beautiful opal.ĭespite no universal agreement on the formation of the common opal, the most common belief is that rain is the source of the precious opal’s aesthetic beauty. One of the most startlingly gorgeous gemstones on the planet, rain is said to be the source of the ever-striking beauty of the common opal. Whether you follow the ancient Greek version of it, or more recent theories, one thing is certain: opal formation is connected to the action of water. Opals seem to have a history connected to them, and it is quite interesting. What makes opals different from other stones?.

How does rainwater cause formation of the common opal?.

Frequently Asked Questions (FAQs) about Opal Stones.

Types of opal