12、 What is crystal?
Crystal is a kind of narrow gem, which is a very ancient gem. Its chemical composition is silicon dioxide. This is a crystal as transparent as water in the quartz group minerals (although it is crystalline but opaque, it can only be called quartz crystal). If purple, tawny or black are formed due to impurities, they are called amethyst, tea crystal and ink crystal respectively; The special variety containing acicular or fibrous mineral inclusions inside is called “crystallization”. The crystal surface of water crystal is glassy, and its shell like fracture is greasy; The hardness is 7, the specific gravity is 2.66, and it has the calendering and optical properties. Crystal has a wide range of uses. It is mainly used as bracelet and necklace beads in jewelry, as well as some small pendants and ornaments. Crystal is mainly produced in Brazil and Uruguay. China’s main origin is Yangjiao Mountain in Hainan Province and the East China Sea in Jiangsu Province.
Natural crystal is clear and transparent, often containing gas-liquid inclusions in the form of star points, clouds or flocs, and microcracks can often be seen. Synthetic crystals have no cracks, but often have small bubbles. In addition, the proportion of synthetic crystal is greater than that of natural crystal when weighed by hand. Compared with glass, the crystal color is white and more bright and dazzling, and the glass white is slightly cyan and yellow, and it is not bright enough; The crystal hardness is 7, and the glass is 5.5. You can use crystal to cut glass. Natural crystal often contains uneven and imperfect phenomena such as ripples. However, glass is usually uniform without ripples due to artificial baking, and there are tiny bubbles. When you lick the crystal, you feel cool, and the glass feels warm.
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