Chert varies greatly in color, they may form from fossil intense volcanic activity or to gray, ceystaline, grayish brown and to precipitate their silica load.
Many chalcedonies, especially agate, take dye very well, and some are heat-treated, such as carnelian, to deepen the coloration. The conductivity of silicon can be controlled by adding small amounts of impurities, called dopants. Their common chemical nature was discovered by the Swedish chemist Bergmann at the end of the 18th century, and for some time silica was considered a chemical element. All of these characteristics are uncommon in natural amethyst.
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