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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. 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).

  4. Opalescence - Wikipedia

    en.wikipedia.org/wiki/Opalescence

    Rough sample of common opal Rough sample of precious opal, showing iridescence. Opalescence or play of color is an optical phenomenon associated with the mineraloid gemstone opal, [1] a hydrated silicon dioxide. [2]

  5. Weewarrasaurus - Wikipedia

    en.wikipedia.org/wiki/Weewarrasaurus

    The specimen was noted for being preserved in green-blue opal, a gemstone for which the region is well known. [1] [2] Palaeontologist Phil Bell was shown the specimen in 2014 and remarked upon its significance, and so Poben donated it to the Australian Opal Centre, which has the world's largest collection of opal fossils. [2] Restoration of the ...

  6. Opalite - Wikipedia

    en.wikipedia.org/wiki/Opalite

    Opalite is a trade name for synthetic opalescent glass and various opal and moonstone simulants. Other names for this glass product include argenon, sea opal, opal moonstone, and other similar names. [1] [2] It is also used to promote impure varieties of variously colored common opal. [1]

  7. Thunderegg - Wikipedia

    en.wikipedia.org/wiki/Thunderegg

    Thundereggs are rough spheres, most about the size of a baseball—though they can range from a little more than a centimeter (one half inch) to over a meter (three feet) across. They usually contain centres of chalcedony which may have been fractured followed by deposition of agate, jasper or opal, [1] either uniquely

  8. Moonstone (gemstone) - Wikipedia

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

    A small rough moonstone sample. Moonstone is a sodium potassium aluminium silicate ((Na,K)AlSi 3 O 8) of the feldspar group that displays a pearly and opalescent schiller. [1] [2] An alternative name for moonstone is hecatolite [2] (from goddess Hecate).

  9. Tyndall effect - Wikipedia

    en.wikipedia.org/wiki/Tyndall_effect

    An example in everyday life is the blue colour sometimes seen in the smoke emitted by motorcycles, in particular two-stroke machines where the burnt engine oil provides these particles. [1] The same effect can also be observed with tobacco smoke whose fine particles also preferentially scatter blue light.

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