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Looks like a sandstone material to me - breaks in layers, looks like it was formed in sheets.....If the layers have been twisted/warped, it's known as a foliated metamorphic rock - metamorphic meaning that it has been changed by heat/pressure, such as being buried deep underground, subject to tectonic actions, etc.

My experience is that metamorphism tends to cause rocks to get harder, but in hammering situations, harder rocks tend to break with better fractures....of course, I work with big down hole pneumatic hammers.
 

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13 Licenses & Counting
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You guys get to do all sorts of cool stuff on the other side of the country. We'd have to spend $200k on permits and it'd take 20 years to get them in order to dig a lake here.
 
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