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) "Jonge Jacob". Captain Michael Seymour replaced Spranger. On 15 May 1807, "Amethyst" captured the privateer "Josephine" some 20 leagues from Scilly. "Josephine" was armed with four 2-pounders guns and small arms. She had a crew of 45 men, but had put ten on board "Jane", which had been sailing from Lisbon. "Josephine" had sailed from the Île de Batz and "Jane" was her only capture. When "Amethyst" captured "Josephine", "Amethyst" was in company with and . Then on 9 September "Amethyst" captured the Danish ship "Twende Venner". Later, on 18 October, "Amethyst" recaptured the ship "Susannah". "Amethyst" also recaptured the