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Quartzite is a hard, metamorphic rock which was originally sandstone transformed through heating and pressure usually related to tectonic compression. Quartzites often occur in various shades of pink and red due to varying amounts of iron oxide. Other colors are due to impurities of minor amounts of other minerals.
La cuarzita es una roca metamórfica dura, originalmente una arenisca transformada a través de la presión y el calor usualmente relacionados con la compresión tectónica. Las cuarzitas suelen presentar tonalidades rosáceas y rojas debido a las cantidades variables de óxido de hierro. Otros colores se presentan por las impurezas en cantidades minoritarias de otros minerales.

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