An interesting point there, Juan, as I don't recall ever seeing a Black_Marble 
in any of the 'includes' (there is a *blue-black* marble with *red* veins 
however). I say "interesting" because if you look at the menu of 3.1 under 
Options/MessageWindow/TilingOptions a Black Marble bmp file is there, so it 
must have been made from something... Maybe the idea was that it's too simple 
to make the opposite of the White_Marble and left it up to others to create.
So, here, everyone:

#declare Black_Marble_Map =
color_map {
    [0.0 rgb <0.2, 0.2, 0.2>]
    [0.8 rgb <0.5, 0.5, 0.5>]
    [1.0 rgb <0.9, 0.9, 0.9>]
}

// Black marble with white veins.
#declare Black_Marble = 
pigment {
    marble
    turbulence 1
    color_map { Black_Marble_Map }
}


>
>There is something that me call attention,  occured that
>translating/studying the part of Patterns- Hexagon ( for example ) of
>the manual of POV-Ray 3.1,  me encounter with a test where was
>utilized the texture "Black_Marble", But this texture I no have in the
>file "textures.inc".
>
>I Ask :The manual is not completely updated to the version 3.1 or to
>my me some lack file?
>
>
>
>Saludos:
>
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>Montevideo-Uruguay
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-- 
 omniVERSE: beyond the universe
  http://members.aol.com/inversez/POVring.html
=Bob

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