Quartzite (from German : Quarzit [1] ) is a hard, non-foliated metamorphic rock which was originally pure quartz sandstone . [2] [3] Sandstone is converted into quartzite through heating and pressure usually related to tectonic compression within orogenic belts . 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 (Fe 2 O 3 ). Other colors, such as yellow, green, blue and orange, are due to other minerals.

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