Stuck deciding between granite and marble for your new kitchen countertops? We asked some experts for their insight on ...

Magnesium makes the gold coloring, Perrin said, and small nuggets of pyrite ... Water seeps down from the rock that rests atop the marble seam, sometimes in vast amounts that can freeze when ...

Unusually small burrows, i.e., tiny tubes that run through the rock in a parallel arrangement from top to bottom, were discovered in marble and limestone of these desert regions. In the desert ...