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  2. Opal - Wikipedia

    en.wikipedia.org/wiki/Opal

    A Peruvian opal (also called blue opal) is a semi-opaque to opaque blue-green stone found in Peru, which is often cut to include the matrix in the more opaque stones. It does not display a play of color. Blue opal also comes from Oregon and Idaho in the Owyhee region, as well as from Nevada around the Virgin Valley. [17] Opal is also formed by ...

  3. Opalescence - Wikipedia

    en.wikipedia.org/wiki/Opalescence

    Each of the three notable types of opal – precious, common, and fire [3] – display different optical effects; therefore, the intended meaning varies depending on context. The general definition of opalescence is a milky iridescence displayed by an opal, which describes the visual effect of precious opal very well, and opalescence is ...

  4. Opaline glass - Wikipedia

    en.wikipedia.org/wiki/Opaline_glass

    The French factory Portieux Vallérysthal in 1930 has put opal glass objects on the market in a particular blue-azure color. Some pieces have decorations in pure gold or polychrome enamels and are sometimes equipped with supports or hinges in gilded bronze (sets of plates, cruets, sets of glasses and cups, boxes, lamps, flacons, chandeliers).

  5. List of individual gemstones - Wikipedia

    en.wikipedia.org/wiki/List_of_individual_gemstones

    Andamooka Opal, presented to Queen Elizabeth II, also known as the Queen's Opal; Flame Queen Opal; Galaxy Opal; Halley's Comet Opal, the world's largest uncut black opal; Olympic Australis Opal, reported to be the largest and most valuable gem opal ever found

  6. Milk glass - Wikipedia

    en.wikipedia.org/wiki/Milk_glass

    Colors include blue, pink, yellow, brown, black, and white. Some 19th-century glass makers called milky white opaque glass "opal glass". The name milk glass is relatively recent. [2] [3] Made into decorative dinnerware, lamps, vases, and costume jewellery, milk glass was highly popular during the fin de siècle.

  7. Moonstone (gemstone) - Wikipedia

    en.wikipedia.org/wiki/Moonstone_(gemstone)

    The name moonstone derives from the stone's characteristic visual effect, called adularescence (or schiller), which produces a milky, bluish interior light. This effect is caused by light diffraction through alternating layers of orthoclase and albite within the stone.

  8. When You See a Blue Jay, It Could Be a Major Sign That You ...

    www.aol.com/see-blue-jay-could-major-184200360.html

    What is the meaning of seeing a blue jay? Among spiritual experts, blue jays can symbolize several things. For instance, since blue jays have loud and unmistakable calls, people think of them as ...

  9. Photonic crystal - Wikipedia

    en.wikipedia.org/wiki/Photonic_crystal

    The opal in this bracelet contains a natural periodic microstructure responsible for its iridescent color. It is essentially a natural photonic crystal. Wings of some butterflies contain photonic crystals. [1] [2] A photonic crystal is an optical nanostructure in which the refractive index changes periodically.

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