[mredskins]

I was wondering if marble was a good conductor of heat because it is always cold when I have touched it. Being the marble in question is black plus this info I presume it can get pretty hot.

Marble is metamorphosed limestone, composed of fairly pure calcite (a crystalline form of calcium carbonate, CaCO3).

Yes, marble as compared to some common materials used for floor lining, is a better conductor of heat, hence appears to be cooler. This is so because its Specific Heat is 2.08 to 2.94, whereas the Specific Heat of other flooring items is lower than this ( Wood 0.12 to 0.17, Wool, felt 0.07, common granite 1.7 to 1.9). The higher the Specific Heat of a material, the faster it will transfer the heat.