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)
Yangtse Incident: The Story of H.M.S. Amethyst Yangtse Incident: The Story of H.M.S. Amethyst Yangtse Incident: The Story of H.M.S. Amethyst (1957) is a British war film that tells the story of the British sloop caught up in the Chinese Civil War and involved in the 1949 Yangtze Incident. It was based upon the book written by Lawrence Earl. The film was known in the US by the alternative titles Battle Hell, "Escape of the Amethyst", "Their Greatest Glory" and "Yangtze Incident". Non-English language titles include the direct German translation of "Yangtse-Zwischenfall", and "Commando sur le Yang-Tse" in France. In Belgium it was known as "Feu sur