Quartzite is a metamorphic rock that forms when sandstone undergoes metamorphism. Its protolith, or parent rock, is sandstone, which is primarily composed of quartz grains. During the metamorphic process, heat and pressure cause the quartz grains in sandstone to fuse together. This transformation leads to the dense and hard rock we know as quartzite. Unlike sandstone, which may contain various minerals and can be porous, quartzite is much more resistant to weathering and erosion, making it a popular choice for construction and decorative stone.
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