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) Guadaloupe, and his suite. On 30 July, "Amethyst" and two other frigates, and , sailed from Plymouth for the Isle of wight. There they were to pick up Dutch troops that they were to return to Holland. On 10 September "Amethyst" captured the French lugger "Alert", and recaptured a ship. In October 1801 Captain Charles Taylor took command of "Amethyst", only to be replaced in the next month by Captain Henry Glynn, for the North Sea. During the Peace of Amiens, "Amethyst" sailed on anti-smuggling patrols off the coast of Scotland under the command of Captain Alexander Campbell. During the