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The quartzite is a hard, non-foliated metamorphic rock which was originally pure quartz sandstone. When sandstone is cemented to quartzite, the individual quartz grains recrystallize along with the former cementing material to form an interlocking mosaic of quartz crystals. Pure quartzite is usually white to grey, though quartzites often occur in various shades of pink and red due to varying amounts of iron oxide (Fe2O3). Other colors, such as yellow, green, blue and orange, are due to other minerals.
The pure quartz crystals are colorless, transparent by gas or liquid inclusions, the crystal becomes a milky color, the impurities also cause color change, or irradiation produces an ionizing phenomenon that changes the color of the crystal.