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Soil texture triangle in R?

Dear R users,

has anybody made an attempt to create the soil texture triangle graph in 
R? For an example see here:

http://www.teachingkate.org/images/soiltria.gif

I would like to get the lines in black and texture labels in gray to 
allow for plotting my texture results on top.

Any examples or suggestions are very welcome!

Thanks in advance,

Sander.