Quartzite is a hard, non-foliated metamorphic rock that was originally pure quartz sandstone. Sandstone is converted into quartzite through heating and pressure usually related to tectonic compression within orogenic belts. Pure quartzite is usually white to grey, through quartzite often occur in various shades of pink and red due to varying amounts of iron oxide. Other colors are due to other minerals’ impurities. Quartzite can also come in yellow, green, blue and orange.
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