Lavastone Nesting Tables - Black LavastoneDescription Open and airy, black finished iron framing supports rounded tabletops of black lavastone. Slide apart for double the surface area, or layer them up to save space. Lavastone is a natural volcanic rock that is extremely durable and a texturally porous material that can absorb moisture. The surface is hand polished and specially sealed with a protective polyurethane wax coating, perfect for use indoors or out. Specs Overall Dimensions: 19.