The deep gray hues of basalt make it a perfect, versatile choice for both internal and external flooring and walls. An igneous, volcanic rock used in architecture since the Roman era, basalt is durable like granite with similar features to limestone. With its beautiful, neutral tones, basalt is an excellent choice for interior or exterior countertop material and can be used in full-sun applications. It can even be used in exterior sidewalk applications. One of the densest stones you’ll find, basalt is also recommended for fireplaces, tub surrounds and showers, vanities and more.