a natural process of decomposing of a nearby radioactive mineral. This is mostly a reversible process, but constant heating can change the distribution of the iron impurities at different sites within the quartz making it impossible to convert it back to amethyst by post irradiation. The heating process can occur naturally or synthetically. It's known to be one of the most valuable quartz stones and it's also known to be high in price. Amethyst is readily available in all sizes and shapes. Amethyst is made out of crystalline quartz. Crystalline quartz is a dichroic crystal and if the quartz is heated it will change the color of the mineral into yellow, creating another gemstone or mineral called citrine. Crystals that are part Citrine and part Amethyst are called Ametrine. There is more of the mineral quartz in the world then there is any other mineral. Quartz takes up about 12% of the earth's crust. Quartz occurs in an unlimited variety of igneous, metamorphic and sedimentary rocks. Types of quartz are separated into two groups based on the size of the individual grains or crystals: Macrocrystalline quartz is where individual crystals are seen only with the naked eye, and cryptocrystalline quartz is where the individual

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Approximate Word count = 829
Approximate Pages = 3 (250 words per page double spaced)