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Are sandstone igenous rocks?
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Is limestone classified as a granite or a sandstone?

Limestone is not classed as either a granitoid or a sandstone
rock. Limestone is a sedimentary rock, either chemically
precipitated or bioclastic in origin. Granite is a plutonic igneous
rock, and sandstone, although sedimentary, is formed from the
cementation of sand-sized particles of eroded rock.