For all its 'you've made it' cache, marble is just a chunk of garden-variety limestone that's had an extreme makeover. In geology-speak, it's the metamorphic version of limestone.

Metamorphic rock is formed when existing rock is transformed under high heat and pressure, which generally destroys any fossils that were in the rock before it was metamorphosed. For example, marble ...

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 ...