Mafic lavas are hot, high in silica, low in volatiles, and relatively viscous. Volcanic lavas are called felsic lavas, and they are usually cooler and include high levels of silica and volatiles.

A manufacturing company called Mafic USA LLC announced Monday it’s opening a manufacturing facility in Cleveland County, where it will take on 113 workers. Mafic will spend more than $15 million ...