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Natural crystal(quartz) is a kind quartz crystalline mineral, its main chemical composition is silica, chemical formula is SiO 2, alias crystal water, Shui bi, water Jade. Well-developed single crystals are hexagonal cones, so they are usually massive or granular aggregate. Generally, it is colorless, gray, milky white, purple, red, smoke (tea), yellow, green, etc. when containing other mineral elements.
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