Amethyst element impurities), and the presence of trace elements, which result in complex crystal lattice substitutions. The hardness of the mineral is the same as quartz, thus it is suitable for use in jewelry. Amethyst occurs in primary hues from a light pinkish violet to a deep purple. Amethyst may exhibit one or both secondary hues, red and blue. The best varieties of amethyst can be found in Siberia, Sri Lanka, Brazil and the far East. The ideal grade is called "Deep Siberian" and has a primary purple hue of around 75–80%, with 15–20% blue and (depending on the light source)
HMS Amethyst (1799) American ship attempting to dock in a French port. This may have been "Caroline", captured on 14 April. In early June Cooke met up with Captain Sir Edward Pellew's squadron at Quiberon Bay. The squadron engaged in a successful large scale raid on Morbihan, though "Amethyst"s role, if any, is unclear. "Amethyst" was among the vessels of a squadron that shared the proceeds for the recapture on 28 June 1800 of "Lancaster". She was also part of Pellew's squadron, which shared in the proceeds of the capture of "Vigilant", "Menais", "Insolent", "Ann", and the wreck of a vessel that was