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
Amethyst RPG also takes into account the disruption of modern technology by magic; the more technologically advanced an item is, the more likely that the Enchantment Disruption Field that encompasses the globe will affect it. Rules in detail are provided for all facets of technological and magical interaction. "Amethyst" was originally published under 3.5 rules and recognized with an Honorable Mention for Best Setting in the 2008 Gen Con ENnie Awards. "Amethyst: Foundations" by Chris Dias was previewed at Free RPG Day of 2009, and then published by 2010 by Goodman Games as a new science fantasy setting for 4th edition "Dungeons