Topic: Opals Formed
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Answers to Common Questions
How are Opals Formed?
Opals are formed when a mixture of water and silica dioxide seeps through sandstone then hardens over a period of time. Opals are extremely beautiful, and over 95 percent of the world's supply can be found in Australia. Read More »
Source: http://answers.ask.com/Fashion_and_Beauty/Jewelry/how_are_opals_f...
How is an opal formed?
Opals are formed when silica (SiO2) spheres all of a similar size, are arranged into a cubic close packed structure. This structure has the ability to diffract certain wavelengths of light based on the spacing in between layers of silica an... Read More »
Source: http://wiki.answers.com/Q/how_is_an_opal_formed
How long does it take for opal to be formed?
Current scientific theory states that opals can take thousands, even millions of years, to form. However, an Australian fossicker has proven that, given the right conditions, the process can actually take place over a matter of months. See ... Read More »
Source: http://wiki.answers.com/Q/How_long_does_it_take_for_opal_to_be_fo...
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Answers to Other Common Questions
"The formation of natural diamond requires very specific conditions—exposure of carbon-bearing materials to high pressure, ranging approximately between 45 and 60 kilobars, but at a comparatively low temperature range between approximately ...
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Source: http://www.answerbag.com/q_view/1767105
Opals formed at low temperatures from silica-bearing waters and they can occur in fissures and cavities of any rock type, usually sedimentary rock. They are formed when the sediment is laid down, pressed and buried to make rock. Water carri...
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Source: http://www.list-of-birthstones.com/October%20Birthstone.html
Opal forms within spaces in rock . It is found within sedimentary rocks , such as sandstone; and in volcanic rocks that have hardened from molten lava with air bubbles trapped inside. The basic ingredients for opal are water and silica - bu...
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Source: http://www.lostseaopals.com.au/opals/index.asp
