Marble, which is metamorphosed limestone, actually typically consists of much more tightly interlocking grains – the water has been driven off by metamorphism, and often the recrystallization of calcite fills in the pore spaces of the original limestone. So with no pore spaces, marble can seem more smooth, especially when polished. But often enough in nature, an outcrop of mable will indeed not be much more smooth than a limestone outcrop.
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