Volga Blue and Black Labrador

can you please tell me about the selection of Volga Blue /Black Labrador for heavy use family kitchen Counter (http://GialloFiorito.com) top.are they real Granite (http://tanbrown.org) - what are they- do they need sealing?   What do you think of ubatuba (premium)being impregnated with the Stonemark process (home Depot). is that good or bad . would you seal or impregnate Ubatuba for a heavy use kitchen? thank you much     suzieq