Crystal Award Plaques
Crystal is an excellent quartz crystal, most of which is colorless and transparent, a small amount of which is different color because it contains various trace elements. It is hard and refracts well. With high quality natural crystal processing made necklaces and eyeglasses, become beautifying...
Crystal is an excellent quartz crystal, most of which is colorless and transparent, a small amount of which is different color because it contains various trace elements. It is hard and refracts well. With high quality natural crystal processing made necklaces and eyeglasses, become beautifying life, dispel diseases and health care high-grade decorations and practical supplies. The crystal necklace is one of the most popular jewelry in the world. It is colorful in the light, glittering and translucent get rid of, can produce special "cat's eye" phenomenon. Crystal contains selenium, zinc, aluminum, titanium and other trace elements, which constantly produce photoelectric effect and electromagnetic field. After processing and grinding, it can focus on energy storage and generate brilliance. But often appear on the market the false crystal that glass makes, when choosing must try to differentiate conscientiously.
1. Hardness test: crystal hardness is 7 degrees, second only to diamond diamond, corundum, topaz and other minerals. Crystals can be used to mark glass and metal, but fakes do not.
2. Try relative density (specific gravity) : the relative density of crystal is 2.60~2.66, which is heavier than organic glass (the relative density of glass is 2.5), and the weight of hand is weighed, and the feeling is obviously different.
3: body feel: the crystal is cold, the hand is cool, under the same low temperature, the crystal is cold and transparent, licking with the tongue, more cold and piercing; Licking glass is not.
4: try the high temperature stability: crystal melting point 1713 ℃, in the above 800 ℃ high temperature calcination is still not in the cold water again after the crack; The fake glass has no fixed melting point and is heated to a high temperature. Currently used as a gemstone crystal, there are colorless crystal, purple crystal, yellow crystal, smoke crystal and hair crystal. Crystal colorless, transparent, used to make crystal ball, jade carving products, crystal top. A light purple crystal used mainly for making ring-face and jade carvings. Pale grey crystal of smoke crystal, mainly used for jade carving. Yellow crystal orange, brown yellow crystal, mainly used to make diamond ring face. Hair crystal crystal crystal crystal contains fine fiber encased amphibole, electropneumatic stone and so on.
1. Physical and chemical properties: crystal chemistry constitutes SIO2. Trigonal system. A crystal is a cylindrical crystal with a tapered head composed of hexagonal biaxial and hexagonal columns. Color: colorless, purple, yellow, brown, gray and black. Transparency. Gloss: glass luster. Refractive index 1. A 1, 544. 553, double refractive index 0. OO9. The hardness is 7. Dense degree of 2. 66 g/cm ^ 3. - shell-like fracture. Amethyst has a weak to clear dichroism.
2. Visual identification features: there are many kinds of crystal on the market, including natural colorless crystal, yellow crystal, smoke crystal and purple crystal. Artificially modified sky blue crystal, orange crystal, purple crystal, dual color water crystal; Synthetic colorless and purple crystals. Because they look basically the same, they are not very different from each other.