According to the characteristics and uses of crystals, it can be divided into four categories:
(1) Piezoelectric crystal: Some of the crystals have a very interesting piezoelectric effect, det er, the greater the pressure (or pulling force) applied to the slices of the piezoelectric crystal, the more electric charges are generated. Its characteristics make it possible to make quartz resonators, filters, ultrasonic generators and various pressure measuring instruments. :
(2) Optical crystal: It has good performance through infrared and ultraviolet light, which can help people use infrared and ultraviolet light.
(3) Smelted crystal: Quartz glass and quartz tube made of transparent and colorless smelted crystal (mostly hand-selected fragments) are widely used in the defense industry, metallurgical industry, chemical industry and electrical industry.
(4) Craft crystals: including colorless crystals, amethysts, citrines, smoky crystals and hair crystals (contains acicular, fibrous rutile, tourmaline, hornblende and other mineral inclusions), which can be used to make crystal balls and figures And various animals and other handicrafts as well as necklaces, chicken hearts, Vedhæng, ring noodles, corsages and other jewelry.
During the crystallization process of crystals produced in nature, other substances (mineral crystals and liquids, gases, osv.) sometimes infiltrate to form various kinds of inclusions, called inclusion crystals, some of which have strange shapes. , The color is beautiful, or can cause special effects, so it has ornamental, collection or research value, so it becomes an ornamental stone or a strange stone.
“Sand crystals” are formed by crystals containing granular minerals and mineral fragments. Generally there are rutile sand crystals, magnetite sand crystals, broken mica sand crystals, garnet sand crystals, chlorite sand crystals, hematite sand products, osv. Mineral particles in the crystal are grouped or individual, showing red, green, lilla, guld, black and other colors, sometimes emitting dazzling star reflections or flashes.
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