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Sandstone ranges from 6 to 7 on the MOH scale (a scale for determining the relative hardness of a mineral according to its resistance to scratching). The hardest mineral, at 10, is diamond. The softest mineral, at 1, is talc.
Pennsylvania Bluestone, a type of sandstone, is denser and less absorbent than Flagstone and is a gray blue with medium to high absorption
Shenandoah Valley Bluestone is limestone, not sandstone! The stone eventually fades from a deep blue to a light grey after prolonged exposure to the sun and rain. Remember, limestone is acid sensitive while sandstone is not. Bottom line: TEST first!