Marble is a metamorphic rock that comes about when limestone sediment is crystallized under pressure to form a hard rock and this makes it durable and long-lasting as well as aesthetically pleasing. Marble is an excellent kitchen worktop material and stays cool in hot summers as it is a poor conductor of heat.

Sandstone is a sedimentary rock composed mostly of quartz sand, but it can also contain significant amounts of feldspar, and sometimes silt and clay. Sandstone that contains more than 90% quartz is called quartzose sandstone. When the sandstone contains more than 25% feldspar, it is called arkose or arkosic sandstone.