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) company with , captured "Agnela". On 30 July "Amethyst" captured the "Ebenezer", and then on 1 August "Amethyst" captured "Juno". In December "Amethyst" participated in the pursuit of a French squadron under Admiral Willaumez. In November 1805 "Amethyst" encountered the brig-sloop off the coast of Madeira. After a series of ambiguous and misinterpreted moves by the other, the two captains mistook each other for enemies and opened fire. Both vessels survived and the two captains proceeded to exchange mutually recriminatory letters. "Amethyst" was among the vessels that shared in the proceeds of the capture, on 25 July 1805, of the