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)
Amethyst Incident and unwounded men who had been sent ashore. He assumed command of the ship that day. During the next few days "Amethyst" moved several times, but each time she got under way the batteries opened fire at her and the ship was forced to anchor, finally finishing up off Fu Te Wei. On 21 April a signal was received: ""HM ships" London "and" Black Swan "are moving up river to escort the" Amethyst "down stream. Be ready to move."" The cruiser and the frigate (ex-sloop and "Amethyst"s sister ship) were heavily shelled as they attempted to help "Amethyst" and retreated