DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Quartzite metamorphic rock. Quartzite is formed when the sedimentary rock, sandstone, is subjected to high temperatures and pressures deep within the Earth's crust. This changes its crystal structure, and it becomes harder and more resistant. Quartzite is normally white or grey in colour, but varying amounts of iron oxide can cause it to appear pink or red.
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