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  2. Quartz - Wikipedia

    en.wikipedia.org/wiki/Quartz

    Quartz crystal demonstrating transparency. Pure quartz, traditionally called rock crystal or clear quartz, is colorless and transparent or translucent and has often been used for hardstone carvings, such as the Lothair Crystal. Common colored varieties include citrine, rose quartz, amethyst, smoky quartz, milky quartz, and others. [33]

  3. Herkimer diamond - Wikipedia

    en.wikipedia.org/wiki/Herkimer_diamond

    Geologists discovered exposed dolomite in Herkimer County outcroppings and began mining there, leading to the "Herkimer diamond" moniker. Double-terminated quartz crystals may be found in sites around the world, but only those mined in Herkimer County can be given this name.

  4. Crystal Mine - Wikipedia

    en.wikipedia.org/wiki/Crystal_Mine

    The quartz ledge at the Crystal Mine was first discovered in 1895 by B. Heins. It was so named because of the large pyrite cubes which were found occurring in the surface outcrops of the ledge. Gold was extracted till 1905 from quartz using ten-stamp mill and from about 1,000 feet of underground workings yielded 1,210 ounces of gold ...

  5. Hurricane Helene shuts down critical mines, endangering AI ...

    www.aol.com/finance/hurricane-helene-shuts-down...

    The two mines, owned by Sibelco and the Quartz Corp., are the only places in the world where a large concentration of high-purity quartz can be extracted, Ed Conway, a journalist and author of the ...

  6. Largest Spruce Pine quartz mine restarts after Helene ... - AOL

    www.aol.com/news/largest-spruce-pine-quartz-mine...

    The company sells its quartz under the brand name IOTA. Its mines are north of downtown in an area called the Spruce Pine Mining District. On Google Maps they look like wide, white sandy beaches.

  7. Spruce Pine Mining District - Wikipedia

    en.wikipedia.org/wiki/Spruce_Pine_Mining_District

    The Spruce Pine Mining District is a swath of the valley of the North Toe River in the Blue Ridge Mountains of northwestern North Carolina. The area is mined for its mica, kaolin, quartz and feldspar. [1] Spruce Pine district is one of the largest suppliers of high-purity quartz, which is used in the manufacture of silicon for integrated ...

  8. Cave of the Crystals - Wikipedia

    en.wikipedia.org/wiki/Cave_of_the_Crystals

    Cave of the Crystals or Giant Crystal Cave (Spanish: Cueva de los cristales) is a cave connected to the Naica Mine at a depth of 300 metres (980 ft), in Naica, Chihuahua, Mexico. It takes the form of a chamber within the limestone host rock of the mine, and is about 109 metres (358 ft) long with a volume of 5,000 to 6,000 cubic metres (180,000 ...

  9. Quartz reef mining - Wikipedia

    en.wikipedia.org/wiki/Quartz_reef_mining

    Quartz reef breaking the surface at Paynes Find, Western Australia. Quartz reef mining is a type of gold mining in "reefs" (veins [1]) of quartz.Quartz is one of the most common minerals in the Earth's crust, and most quartz veins do not carry gold, but those that have gold are avidly hunted by prospectors.

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