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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. [16] Opal is also formed by ...

3. Opaline glass - Wikipedia

   en.wikipedia.org/wiki/Opaline_glass

   Austrian opaline glass bowl, 1914. Opaline glass is a style of antique glassware that was produced in Europe, particularly 19th-century France.It was originally made by adding materials such as bone ash to lead-crystal, creating a semi-opaque glass with reddish opalescence.

4. 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 ...

5. Chrysoprase - Wikipedia

   en.wikipedia.org/wiki/Chrysoprase

   The word chrysoprase comes from the Greek χρυσός chrysos meaning 'gold' and πράσινον prasinon, meaning 'green'. Unlike emerald which owes its green color to the presence of chromium, the color of chrysoprase is due to trace amounts of nickel compounds in the form of very small inclusions.

6. Ammolite - Wikipedia

   en.wikipedia.org/wiki/Ammolite

   Ammolite is an opal-like organic gemstone found primarily along the eastern slopes of the Rocky Mountains of North America.It is commonly unearthed by natural erosion or through the process of various mining practices, within the perimeter of an ancient sea bed called the Western Interior Seaway. [2]

7. World's most expensive opal literally glows in the dark - AOL

   www.aol.com/news/2015-08-13-world-s-most...

   In fact, as it gets darker around the opal, the opal appears ever more vibrant. The stone's vivid and sparkly nature is in stark contrast to Coober Pedy, Australia where it was discovered.

8. Jasper - Wikipedia

   en.wikipedia.org/wiki/Jasper

   Jasper, an aggregate of microgranular quartz and/or cryptocrystalline chalcedony and other mineral phases, [1] [2] is an opaque, [3] impure variety of silica, usually red, yellow, brown or green in color; and rarely blue.

9. Petrified wood - Wikipedia

   en.wikipedia.org/wiki/Petrified_wood

   Petrified wood (from Ancient Greek πέτρα meaning 'rock' or 'stone'; literally 'wood turned into stone'), is the name given to a special type of fossilized wood, the fossilized remains of terrestrial vegetation.