Norwegian mica-schist millstones are preserved at two sites in the upper Midwest of the United States, the Vesterheim Norwegian-American Museum in Iowa, and Beckman Mill in Wisconsin. Based on their mineral composition, the stone for these millstones was quarried at two classic Norwegian mica-schist millstone quarry regions, Hyllestad and Selbu. These millstones were brought to the American Midwest at a time when commercial mills were scarce and when wheat was a key crop.