In 2018, all eyes are on the erupting volcanic magmas of Hawaii – rivers, fountains, and vertical plumes – all producing a dark, fine-grained rock known as basalt. Basalts melt in the earth’s mantle and are relatively low in silica – hence they are ‘runny’ or have low viscosity.
Michigan, United States
Mineshaft basalt is mined in the copper-rich district of upper Michigan.
Upper Peninsula, Michigan