Quartzite has been gaining popularity as a high-end countertop material in recent years. This is due to its beautiful veining and unique color variation. Quartzite is composed of sandstone that has undergone a pressure and heat fueled metamorphosis. Quartzite rates the highest on the Moh scale when compared to other countertop options. It is hard enough to dull knives, is heat, and is acid resistant. Quartzite does not etch or scratch like marble. Quartzite needs to be sealed. The frequency will depend on the porosity of your slab.