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 not see "Amethyst" in the dark. When the battery opened fire, the fire was directed at the "Kiang Lin Liberation" which was sunk by the gun fire, with heavy civilian casualties. At 0500 hours on 31 July, "Amethyst" approached the PLA forts at Par Shan (Baoshan) and Woosung (Wusong) which had their searchlights sweeping the river. At 0525 a planned meeting with the destroyer took place, at which point "Amethyst" sent the signal "Have rejoined the fleet south of Woosung. No damage. No casualties. God save the King". "Concord" had been ordered to prepare to provide gun support to "Amethyst"