Found all over the world, calcite is the most stable form of calcium carbonate and is the main mineral found in limestone. We ...

For almost a century, scientists have been puzzled by a process that is crucial to much of the life in Earth's oceans: Why does calcium carbonate, the tough material of seashells and corals, sometimes ...

All that glitters ... might be rock. Collector Marc Weill (center), with adviser Dennis Tanjeloff (left) and partner Daniel Trinchillo, the "Indiana Jones" of the operation. Together, they've amassed ...

Stefan Nicolescu, collections manager at the Yale Peabody Museum of Natural History looks at Gail and Jim Spann’s collection of gemstones in Rockwall. Photo by ALLISON SLOMOWITZ - special contributor ...