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What is the difference between crystal and glass? How should crystal and glass be distinguished?
Oct 26, 2018


First, what is the difference between crystal and glass?

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Glass is a non-all inorganic material. It is an inorganic thermoplastic polymer. It can be formed at temperatures above 650 oc. It has the characteristics of transparency, corrosion resistance, wear resistance and pressure resistance after cooling. The thermal expansion coefficient of glass is low. Yusteel is a poor conductor of electricity and heat and is a kind of brittle amorphous material. Specific gravity: 2.46~2.5 Linear expansion coefficient: 9~10x10-6/oc(~350oc) Specific heat: 0.2(0o~50oc) Practical surface tensile strength: 500kgf/cm2 The name of glass originated from Tang, which means that the glass raw material plus lead oxide is called crystal glass. The proportion of lead oxide added varies with the customary definition of each country. Generally speaking, When the proportion of lead oxide is more than 24%, the transmittance and refractive index of the glass are both good, and also heavy and soft, which is very suitable for firing into a fine glass art.


        When talking about crystal wares in Europe and the United States, it means using such crystal glass materials. The price is not expensive compared with ordinary glass. The artificial glass "glazed glass" is glass, but the addition of lead is very crystal clear and some people call it crystal. If you appreciate it with pure artistic vision, of course, there is also a collection value. If you have the natural crystal natural glass energy or the time of growth is very different. This must be understood. Like Austria or Italy, high-priced crystal cup glass Plate wine bottle, or crystal glass for decoration, all kinds of cute animals, Buddhist crystal lotus glass, crystal chandelier, almost all crystal glass! No magnetic energy. Crystal glass is actually made of natural crystal. Glass, which is often heard of lead glass, can increase the refractive index of glass by adding lead in glass, and also reduce the hardness to make it easy to honed; the beautiful crystal cup that is generally sold is also lead glass. The difference between crystal and glass is the appearance of crystal and glass. Very similar, but it is two completely different substances.


Second, how should crystal and glass be distinguished?

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One of the following characteristics can be determined as a synthetic crystal:


         (1) A layer of ash will fall on the glass table that will not be rubbed for a period of time. This phenomenon must have been seen before. If you see a phenomenon like “desktop dust” inside the crystal, it means that there are many very small crystals. Gray or white dots are distributed along a plane or several parallel planes, and the rest of the crystal is very clean. That's basically synthetic crystal.


         (2) There are sometimes some very thin hollow tubular inclusions in synthetic crystals. These empty tubes are also basically parallel, sometimes leading to the surface, or they may be big and small, like nails. This is only synthetic crystal. Yes, it may be some flux residue during synthesis.


         (3) Natural crystals are basically not green, or extremely rare. Like green ghosts, green hair crystals, etc., the inclusions inside are green, but the crystal itself is colorless and transparent. So there are a lot of people on the market. Green transparent crystal, the color is basically processed, and most of them are synthetic crystals.


Related concepts:

crystal

         Quartz Crystal is a colorless and transparent large quartz crystal mineral. Its main chemical component is silica, and its chemical formula is SiO2. The crystal is colorless, purple, yellow, green and smokey, glassy, transparent to translucent. Hardness 7, brittle, no cleavage; crystal density 2.56-2.66 g / cm3, crystal refractive index 1.544-1.553, almost no more than this range; crystal dispersion of 0.013, crystal melting point of 1713 ° C. When it is pure, it forms a colorless and transparent crystal. When it contains trace elements such as Al, Fe, etc., it is purple, yellow, brown, etc., and irradiates trace elements to form different types of color centers, which produce 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.


glass

         Glass is an amorphous inorganic non-metallic material, generally made up of a variety of inorganic minerals (such as quartz sand, borax, boric acid, barite, barium carbonate, limestone, feldspar, soda ash, etc.) as the main raw material, and a small amount of auxiliary materials are added. of. Its main components are silica and other oxides. The chemical composition of ordinary glass is Na2SiO3, CaSiO3, SiO2 or Na2O·CaO·6SiO2, etc. The main component is a silicate double salt, which is an amorphous solid with a random structure. Widely used in buildings, used to separate light from the wind, is a mixture. There are also colored glass in which certain oxides or salts of metals are mixed to form a color, and tempered glass obtained by physical or chemical methods. Sometimes some transparent plastics (such as polymethyl methacrylate) are also called plexiglass.


coloured glaze

         coloured glaze and glass are also made of artificial crystals (including 24% lead dioxide) in various colors (formed by various rare metals). They are fired at a temperature of more than 1000 degrees. of. Its color is cloudless; its quality is crystal clear and dazzling. The material used to make glass in ancient China was obtained from the by-products produced during the casting of bronze, and was refined and then made into glass. The color of the glaze is varied, and the ancients also called it "five-colored stone." In ancient times, it was difficult for folks to get it, so people thought that the glass was even more precious than jade. In June 2008, the glaze firing technique was selected by the State Council to approve the second batch of national intangible cultural heritage listed by the Ministry of Culture. At present, the glass on the market is mainly dewaxed glass represented by the south (to Taiwan) and hand-painted glass represented by Boshan (Zibo). The famous teams in domestic glass production are Liuli Workshop, Renli Glass, and Liyuan.


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