Amethyst, a spread of quartz, receives its purple color from the presence of iron and aluminum impurities inside the crystal lattice. The pink coloration can variety from faded lilac to deep violet, and it's far often attributed to the presence of iron ions, particularly Fe3+ (iron with a nice charge of +3). the exact system of the way amethyst acquires its color is not completely understood, however it is generally believed to involve the irradiation of colorless quartz containing hint quantities of iron. The irradiation may arise obviously over geological time or can be elevated through synthetic procedures in a laboratory. warmness treatment can also influence the shade of amethyst. as an instance, exposure to high temperatures can cause certain colour centers in the crystal to lose their electrons, ensuing in a exchange in color. but, in the case of amethyst, the heat treatment is normally used to decorate the prevailing shade instead of set off it. it's well worth noting that amethyst is simply one in all many colored sorts of quartz, and different impurities can provide rise to diverse hues in other quartz sorts.