*Size, shape, and color vary. Just like the Lake, herself.
Basalt is one of the most common rocks found on the shoreline of Lake Superior. It is one of the rocks that makes up the bedrock of the earth’s crust! Basalt, simplified, is lava that cooled very quickly on the surface forming very small crystals because of the quick cooling. Basalt ranges from black to bluish-black. The glaciers of the last receding ice age ground down this lava stone breaking it apart in to millions of pieces, only to be polished off by the biggest rock polisher inland, Lake Superior.