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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.
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.
