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Quartz (SiO2) is known as a silicate, which form the largest and best known class of minerals. Quartz is very common, making up approximately 12% of the earth's crust. Pure quartz is colourless. However, when impurities are present there is a whole range of colours. Quartz in its purest form is transparent, otherwise it is translucent. Two of the most common varieties of quartz are amethyst and citrine. [BM] {CC} {SS}
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