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From Terraria Wiki
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Smooth Marble Blocks are smoother versions of Marble Blocks. They can be crafted from Marble blocks at a Work Bench and provide a full furniture set.
Smooth Marble strongly resembles either the real-life Carrara Marble, found in Carrara, Tuscany, Italy, or Volakas Marble, found in Volakas, Elis, West Greece, Greece.