How Do Opals Form?

Answer

Opals are precious stones in which one can see vibrant colours which change as you move and look at them from different directions. Opal spheres seem to form in areas where silica is crystallising out of water. Normally this process cannot start in the centre of the water because there is nothing for the crystal to start to form on, so crystals grow out from the walls. But if there is Uranium decaying in the water the radiation it produces can from a nucleation point and start a crystal. All these small crystals form the centres of the spheres in the opal.
Q&A Related to "How Do Opals Form"
Opals are formed when a mineraloid gel mixed with water begins to dry. A mineraloid gel is a mixture of minerals and chemicals that does not contain any crystals. The gel will not
http://www.ehow.com/how-does_4911640_how-opals-for...
Opal is formed from a solution of silicon dioxide and water. As water runs down through the earth, it picks up silica from sandstone, and carries this silica-rich solution into cracks
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A Simple Explanation - Opal is formed from a solution of silicon dioxide and water. As water runs down through the earth, it picks up silica from sandstone, and carries this silica-rich
http://answers.yahoo.com/question/index?qid=100512...
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
http://www.list-of-birthstones.com/October%20Birth...
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Mineraloid is a mineral substance that does not have a defined chemical form. It is not crystalline and may not be in solid form. Opal and pearl are both mineraloids ...
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