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  2. Opal - Wikipedia

    en.wikipedia.org/wiki/Opal

    Another type of opal from Mexico, referred to as Mexican water opal, is a colorless opal that exhibits either a bluish or golden internal sheen. [14] Precious Mexican Fire Opal has bright green and yellow patches (play of color) with an orange-red background typical of Fire Opal. Opal occurs in significant quantity and variety in central Mexico ...

  3. List of U.S. state minerals, rocks, stones and gemstones

    en.wikipedia.org/wiki/List_of_U.S._state...

    Precious Gemstone: Virgin Valley black fire opal (1987) Semiprecious Gemstone: Nevada turquoise (1987) ... State Jewelry: Black Hills Gold: Tennessee [66] Agate (2009)

  4. Demantoid - Wikipedia

    en.wikipedia.org/wiki/Demantoid

    Demantoid is the green gemstone variety of the mineral andradite, a member of the garnet group of minerals.Andradite is a calcium- and iron-rich garnet.The chemical formula is Ca 3 Fe 2 (SiO 4) 3 with chromium substitution as the cause of the demantoid green color.

  5. Turquoise - Wikipedia

    en.wikipedia.org/wiki/Turquoise

    Turquoise is an opaque, blue-to-green mineral that is a hydrous phosphate of copper and aluminium, with the chemical formula Cu Al 6 (PO 4) 4 8 ·4H 2 O.It is rare and valuable in finer grades and has been prized as a gemstone for millennia due to its hue.

  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. Assad's fall brings 'the moment' to rid Syria of chemical weapons

    www.aol.com/news/assads-fall-brings-moment-rid...

    THE HAGUE (Reuters) -The downfall of Syria's Bashar al-Assad, found to have used chemical weapons against his own people on multiple occasions during the civil war, creates an opportunity to rid ...

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