It can seem to be a dramatic effect, but you can see similar changes with iron ions in other stones. The charge of the Fe ion changes with temperature, altering the color of the stone. These crystals form at the following temperatures:Ĭitrine is relatively rare since it requires higher temperatures to form. Of these, prasiolite is the rarest since it forms only in a narrow band of temperature between amethyst and citrine. As long as the gem is colored yellow or orange through, and not just on the surface by something like ferrous oxide, it can be called citrine. There may even be multiple causes of the coloration.Ĭitrine is a gem name, not a scientific classification. The above is the most common explanation found, and the one I tend to agree with. Please note that there are a few trains of thought on how citrine acquires its color. They are amethyst, prasiolite, and citrine respectively. Depending on the formation temperature of the stone, you end up with one of three different forms of quartz. Indeed, the shape of a quartz point is often the basis for other crystals in art.Ĭitrine is a form of quartz that has iron in the color centers of the crystals. It’s known for its hexagonal shape and sharp terminations at the end of the crystal. Silica makes up a large amount of the earth’s crust, and quartz is one of the most iconic crystals around. Quartz is silica, SiO₂, with a macroscopic crystal form. It’s almost identical in physical makeup to amethyst, but differences in the original formation of the crystal cause it to take on a different color. Citrine is a variety of quartz that’s colored yellow to orange.
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