What exactly is Concrete Countertops Tampa? Material: concrete. Purpose: It is a type of material used for countertop surfaces, walls, and floors. Analysis: Concrete is a sedimentary rock composed of silica, calcium, iron, and magnesium, which occurs naturally on the earth's surface. When the right conditions exist, it can become a semi-solid form. Countertop spotlight series helps you understand how concrete countertop materials come to be. Environmental Impact: Although the production and transportation of concrete are energy-efficient, concrete production and transport are also energy-consuming, although this may be reduced if concrete pieces are recyclable or otherwise locally produced.