Gem Quality Amethyst

Origination: Uruguay
Approximate: Height - 18" - Width - 4" - Depth - 3"
Gem Quality Amethyst: $0000.00 U.S.D.
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Beautiful Uruguayan gem-quality deep purple, clear crystals amethyst specimen.

Amethyst is a violet variety of quartz often used in jewelry. The ancient Greeks wore amethyst and made drinking vessels decorated with it in the belief that it would prevent intoxication. It is one of several forms of quartz. Amethyst is a semiprecious stone and is the traditional birthstone for February. The mining in Artigas Uruguay started in the middle of 19th century.

Of  variable intensity, the color of amethyst is often laid out in stripes parallel to the final faces of the crystal. One aspect in the art of lapidary involves correctly cutting the stone to place the color in a way that makes the tone of the finished gem homogeneous. Often, the fact that sometimes only a thin surface layer of violet color is present in the stone or that the color is not homogeneous makes for a difficult cutting. The color of amethyst has been demonstrated to result from substitution by irradiation of trivalent iron (Fe3+) for silicon in the structure,[3][5] in the presence of trace elements of large ionic radius,[2] and, to a certain extent, the amethyst color can naturally result from displacement of transition elements even if the iron concentration is low. Natural amethyst isdichroic in reddish violet and bluish violet,[3] but when heated, turns yellow-orange, yellow-brown, or dark brownish and may resemble citrine,[6] but loses its dichroism, unlike genuine citrine. When partially heated, amethyst can result in ametrine.

https://en.wikipedia.org/wiki/Amethyst
https://www.google.com/search?q=amethyst+uruguay++mining&espv=2&biw=1920&bih=979&tbm=isch&tbo=u&source=univ&sa=X&ved=0CCoQsARqFQoTCO3C_vWboccCFQYwiAodAm4MmA

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