The Marble texture map can be used to generate a procedural marble texture. It uses two colors that can also have texture maps assigned to them.

Any texture can be replaced via the Replace With New Texture () button, which activates when you select the texture to be replaced. If the texture is an instance, all copies are changed as well.

Color Base – Specifies the main color of the marble. All parameters in this section can have a texture map assigned to their channel, as long as the checkbox is enabled. 

Color Vein – Specifies the color of the marble's veins

Vein Width – Controls the thickness of the marble veins.

Diffusion – Controls the amount of blur applied to the veins.

Contrast – Controls the contrast.

Noise Attributes

Amplitude  – Controls the amount of distortion in the marbles vein's. A value of 0 makes these a straight line. 

Ratio – Controls the fractal noise frequency (from low to high frequency).

Ripples – Controls the scale of the fundamental frequency of the fractal nous used in the texture.

Depth Min – Minimum level of the fractal noise.

Depth Max – Maximum level of the fractal noise.

Color Manipulation

Invert Texture – Inverts the RGB texture values.

Alpha from Intensity – Uses the texture RGB intensity/luminance as alpha channel.

Color Gain – Corrects the color of the texture by multiplying the the RGB color values in the texture with the RGB color values specified here. When a texture is selected, it overrides the color as long as the texture checkbox is enabled. 

Color Offset – Corrects the color of the texture by adding the RGB color values specified here to the RGB color values in the texture. When a texture is selected, it overrides the color as long as the texture checkbox is enabled. 

Default Color – Specifies a default color used for polygons with no valid UVs. In case the map is not tiled, specifies a default color that is used outside the texture square.  When a texture is selected, it overrides the color as long as the texture checkbox is enabled.

Mode – Specifies the multiplication mode of the colors. 

Multiply – Multiplies the RGB numbers for each pixel of the top layer with the RGB number of the corresponding pixel from the bottom layer. The result is a darker picture. The color used for blending is black.
Blend Amount–  Takes each pixel from the top layer if present. Otherwise the bottom layer is used. The color used for blending is the one specified in the color slot.

Color Base – Blends between a color and a texture, if specified.

Color Vein – Blends between a color and a texture, if specified.