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) of York to the Netherlands and later participated in the evacuation of the force following the campaign's collapse. On 18 December she and recaptured the brig "Jenny". Eleven days after that, "Amethyst" and "Beaulieu" recaptured the ships "Dauphin", "Cato", "Cabrus", and "Nymphe". On 29 December "Amethyst" captured the French privateer brig "Aventurier" (or "Avanture"). "Aventurier", out of Lorient, was armed with 14 guns and had a crew of 75 men. One month earlier, on 29 November, "Aventurier" had captured the American ship "Cato" and taken her master, John Parker, and his crew prisoner. When "Amethyst" captured "Aventurier" Cooke freed the