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  2. Opal - Wikipedia

    en.wikipedia.org/wiki/Opal

    Multicolored rough opal specimen from Virgin Valley, Nevada, US. The Virgin Valley [39] opal fields of Humboldt County in northern Nevada produce a wide variety of precious black, crystal, white, fire, and lemon opal. The black fire opal is the official gemstone of Nevada. Most of the precious opal is partial wood replacement.

  3. Virgin Valley - Wikipedia

    en.wikipedia.org/wiki/Virgin_Valley

    The downstream Nevada half of the valley has the very beginnings of Lake Mead, about 20 miles (32 km) upstream, where the Virgin River used to flow. Littlefield, AZ in the valley's northeast [ 4 ] is located at 36°54′0″N 113°56′0″W  /  36.90000°N 113.93333°W  / 36.90000; -113.

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

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

    Nevada [46] [47] Metal: Silver (1977); Nevada's nickname is the Silver State: Sandstone (1987) Precious Gemstone: Virgin Valley black fire opal (1987) Semiprecious Gemstone: Nevada turquoise (1987) New Hampshire [48] Beryl (1985) Granite (1985); New Hampshire's nickname is the Granite State: Smoky quartz (1985) New Jersey [49] Franklinite [50 ...

  5. Sheldon National Wildlife Refuge - Wikipedia

    en.wikipedia.org/wiki/Sheldon_National_Wildlife...

    The refuge contains the very active and popular Virgin Valley Opal Mining District whose mineral rights were grandfathered-in with the establishment of the sanctuary. [3] Rockhounds search for precious opal, agates, petrified wood, carnelian, obsidian, rhyolite, jasper, hyalite opal, and psilomelane, among other semiprecious gemstones.

  6. Flora Haines Loughead - Wikipedia

    en.wikipedia.org/wiki/Flora_Haines_Loughead

    Nevada's Virgin Valley is a source for precious black opal gemstones and replacing woods. Her next career started in 1915 when she was sent to investigate the discovery of opals in Virgin Valley, Nevada, 400 miles (640 km) from San Francisco.

  7. Paleontology in Nevada - Wikipedia

    en.wikipedia.org/wiki/Paleontology_in_Nevada

    In 1908 more discoveries were made in the Virgin Valley area in beds being exploited for opal. There naturally occurring casts of twigs, limbs, and cracks of petrified wood were found. [1] In 1912 a slab of rock preserving fish, a primitive horse, mollusks, and plants, near Esmeralda Field. [12]

  8. Category:Valleys of Nevada - Wikipedia

    en.wikipedia.org/wiki/Category:Valleys_of_Nevada

    Antelope Valley (Nevada) B. Big Smoky Valley; Bitter Spring Valley; C. ... Virgin Valley; Y. Yucca Forest This page was last edited on 24 February 2022, at 16:54 ...

  9. 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]

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