The .blend file contains the following 8 procedural rock materials with a variety of configuration options.
    - Sand Rock: Crack Strength, Crack Scale, Darkness, Displacement scale parameters
    - Marble White: Scale, Black parameter (Setting the Black parameter to 1 results in a similar to the Black Marble, but slightly different style)
    - Marble Black: Scale parameter
    - Granite Light: Scale, Age parameters
    - Granite Dark: Scale, Age
    - Lime Stone: Surface scale, Displacement scale
    - Stone Bricks: Scale, Lightness parameters
    - Terracotta: Scale, Age parameters