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) days. Still, the ship was too badly damaged to salvage and by 10 March wave action had broken up the hull. The subsequent court martial found Walton and Robert Owen, the master, negligent and reprimanded both for allowing "Amethyst" to be anchored so close to shore with only one anchor. The court also barred Owen for a year from serving in anything larger than a sixth rate. Notes Citations References HMS Amethyst (1799) HMS "Amethyst" was a Royal Navy 36-gun "Penelope"-class fifth-rate frigate, launched in 1799 at Deptford. "Amethyst" served in the French Revolutionary Wars and the Napoleonic Wars, capturing