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 (1903) the buoys in the outer harbour. "Amethyst"s boats assisted in rescuing the survivors. For much of the autumn of 1915, "Amethyst" stayed in port and acted a temporary depot ship for British submarines passing through on patrol. On 19 November, "Amethyst" headed towards Malta and thence to Gibraltar, arriving on 27 November. On 1 December she set out for Portsmouth, and then on 11 December for Barrow-in-Furness where she moored up in Devonshire Dock. She remained there until 14 March 1916 when she headed south to Plymouth, then Bilbao and arriving in Gibraltar on 23 March. In 1916 Commander Edward