Amethyst even if the iron concentration is low. Natural amethyst is dichroic in reddish violet and bluish violet, but when heated, turns yellow-orange, yellow-brown, or dark brownish and may resemble citrine, but loses its dichroism, unlike genuine citrine. When partially heated, amethyst can result in ametrine. Amethyst can fade in tone if overexposed to light sources and can be artificially darkened with adequate irradiation. Amethyst was used as a gemstone by the ancient Egyptians and was largely employed in antiquity for intaglio engraved gems. The largest Ancient Egyptian amethyst mines are located at Wadi el-Hudi and those mines may be the
HMS Amethyst (1799) officers finally permitted the press gang from "Immortalite" to board, all they found on board were a few sickly sailors. Some seven months later, on 11 November 1803 "Amethyst" captured "Spes", H. L. Cornelia, master. Three days later, "Amethyst" captured "Johannes". That same day "Amethyst" captured "Irene", L. J. Lubbens, master. In June 1804, a court martial dismissed Campbell from command of "Amethyst" and stripped him of all his seniority on the Captain's List for misconduct in an action with four Dutch vessels off the coast of Norway. Command transferred to Captain John Spranger. On 24 July "Amethyst", while in