A code:
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plane {
  y, 0
  texture {
    pigment { color rgbf <0.2, 0.2, 0.2,0.9> }
     finish { reflection 0.3 diffuse 0.2 specular 0.2}

        normal { cells scale 0.5 }


    normal { hexagon
      normal { agate 3 scale 0.7 }
      normal { cells 3 scale 0.2 }
}
}
}

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