Crystal is a rare mineral, a kind of gemstone, quartz crystal, belonging to the quartz family. The main chemical component is silica. The chemical formula is SiO2. When pure, it forms a colorless and transparent crystal. When it contains trace elements such as Al and Fe, it is purple. Yellow, brown, etc., irradiate trace elements to form different types of color centers, producing different colors, such as purple, yellow, brown, pink and so on. Containing inclusion minerals is called inclusion crystal, such as hair crystal, green ghost, etc., the inclusions are rutile, tourmaline, actinolite, mica, chlorite and so on. When the crystal of silica is perfect, it is crystal; the crystal is imperfect is quartz: silica gel is dehydrated and is agate; silica hydrogel is solidified and becomes opal; when silica crystal grains are less than a few microns, it is composed. Chalcedony, vermiculite, secondary quartzite. Most of the crystals come from South Africa, Brazil, Uruguay, etc. Of course, there are also crystals produced in China. Because the crystals contained in the crystals have various traces of metal elements, in this case, different kinds of colors will be produced, and color Different, crystal also has different magnetic fields and functions.
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