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Opal is a hydrate amorphous form of sillica classifying it as a mineraloid instead of a mineral like the crystalline forms or sillica.  It occurs in the fissures of almost any kind of rock, but is most often found within sandstone, limonite, rhyolite, basalt, and marl.

The internal structure of precious opal makes it diffract light. Opal can take on many colors depending on the condtition in which it is formed. Precious opal ranges from clear through white, gray, red, orange, yellow, green, blue, magenta, rose, pink, slate, olive, brown, and black. Of these hues, the black opals are the rarest, whereas white and greens are the most common. Opals vary in optical density from opaque to semitransparent.

For gemstone use, most opal are cut and polished into the cabochone shape. The word 'opal' is adapted from the Latin term opalus,  meaning "to see a change in color"

Mytholology: In the Middle Ages, opal was considered a stone that could provide great luck because it was believed to possess all the virtues of each gemstone whose color was represented in the color spectrum of the opal. It was also said to offer its wearer the power of invisibility if wrapped in a fresh bay leaf and held in the hand. Opals have also been associated with bad luck and death as well as the embodiment of the evil eye. It is considered the birthstone for persons born in October.

Metaphysical Properties of Opal varies by the color and type of opal.


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