Marble is best known for what it can be made into — incredible artworks or tacky ashtrays. But before it was that prized white-grey rock, marble was something a lot more pedestrian — limestone. For ...

When the British torched the U.S. Capitol in 1814, the search for the ideal stone to build a newer, more beautiful symbol of American democracy began with a carriage ride to Loudoun, Frederick, and ...

There are three types of rock found on Earth. These are igneous, metamorphic and sedimentary. Each rock type is formed in a different way. For example, the rock malachite is mostly made of the ...