Crystal is one of the more jewellery items on the market. Do you know how to write crystal English?
Crystal is a quartz (Quartz) crystal mineral whose main chemical composition is silica and its chemical formula is SiO2. The crystal is in crystal or rockcrystal.
Western countries believe that as long as the crystal is transparent, the word crystal contains colorless and transparent glass (K9, ordinary glass blue), also contains natural crystal ore. The ancient Chinese crystal name is more than ten kinds of water, such as water essence, water blue, water jade, spar, etc., and it is purified in the "He Han Sancai". Therefore, in order to facilitate the distinction, the natural crystal is usually referred to as (Rock crystal). A well-developed single crystal is a hexagonal pyramid, so it is usually a block or granular aggregate, generally colorless, gray, milky white, and contains other mineral elements such as purple, red, smoke, tea, and the like.
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.
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