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Nero Portoro is a black marble with gold veining throughout. It is a sedimentary rock.
Compression tensile strength 1862 kg/cm²
Tensile strength after freeze-thaw cycles 1597 kg/cm²
Unitary modulus of bending tensile strength 104 kg/cm²
Heat expansion coefficient 0,0050 mm/m°C
Water imbibition coefficient 0,007400
Impact strength 25 cm
Frictional wear 2712 kg/m³