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Quartz is a silicon oxide crystallizing.
The smoky quartz is present in all shades of brown, pale brown to dark brown until black ones. The design of quartz stone is very typical: generally squat crystals are very different from white or clear quartz, which makes it easy to differentiate natural smoky quartz from smoky quartz by irradiation.
The main deposits are located in France, Brazil and in pegmatites of Pike's Peak in Colorado.

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