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 rocks that are formed from igneous rocks won’t contain the combustible elements – the ones that burn – but metamorphic rocks made from sedimentary rocks might.

Citation: Yakymchuk, C. , & Godin, L. . (2012). Coupled role of deformation and metamorphism in the construction of inverted metamorphic sequences: An example from far-northwest Nepal. Journal of ...

Some rocks are harder than others. For example, granite is a very hard rock. This makes it a good material for building as it doesn’t wear away easily. Marble is another hard rock.