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Quenching - a method used in jewelry making to quickly reduce the temperature of heated metal by submerging it in a liquid.
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Quartz - a crystalline form of silica.
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Quartz Glass - a fused amorphous quartz.
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Quartzite - a rock consisting of a granular interlocking mass of quartz crystals (when small crystals of mica are present it forms aventurine quartz).
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Quartz Topaz - a misleading name for the citrine variety of quartz.