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Natural crystal (quartz) is a type of quartz crystal mineral with its main chemical component being silicon dioxide, chemical formula SiO2, also known as water crystal, aquamarine, aqua jade. Well-developed single crystals are hexagonal cones, so they are usually blocky or granular aggregates. Generally colorless, gray, milky white, and when containing other mineral elements, they appear purple, red, smoky (tea), yellow, green, etc.