紫晶 is a 宝石 found within the 地下 and 洞穴 地层s of a world. They are obtained by breaking special 物块s that have noticeable purple gemstones embedded in it. They can also be extracted from 泥沙, 雪泥, or 沙漠化石 by putting them in an 提炼机. Rarely, Amethyst can be found in bulk in its own special gemstone cave, or in one that contains all of the other gems as well (besides 琥珀). Out of all available gems, Amethyst is the least valuable gem.
Like all other gems, Amethyst can be placed on blocks. They cannot be reverted back into their 石块 version once mined.