Slate the rock not the website

How many of you have ever seen slate riven? Check out this video at:
http://www.youtube.com/watch?v=-3LkIJsJHAw&feature=player_embedded
The Honister Mine in the UK, an old slate mine that has been revived, has several videos on YouTube and they show how sheets of slate, a major roofing product, are produced.
VW

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