Which One's hotter in bright sunlight-Dark Granite or light-coloured limestone

I've come across a statement in a textbook stating "Light coloured rock, like limestone, is a poor conductor, so heating is confined to the surface, giving very high rock surface temperatures in hot deserts in daytime." It then goes on to say that darker granite, absorbs the radiation, conducts it downwards into the soil and thus results in lower surface temperatures. This statement seems odd to me as i know that darker objects both absorb and emit more radiation, and thus i would expect the darker granite to emit more heat and therefore have a higher surface temperature. In contrast, the lighter limestone would reflect the radiation keeping the rock cooler. Similar to how a matte black car in sunlight will be hotter to the touch than a white car. Also, granite has a lower specific heat capacity and thus would take less energy to heat it up would it not? So my question is which is right: Is the granite cooler because it conducts the absorbed heat quickly into the soil below, or is it hotter due to its black colour absorbing and emitting more of the radiation, rather then reflecting it?