Just a few minerals make up most of the rocks we see, though: feldspars, amphiboles, quartz, olivine, garnet, micas, calcite, and pyroxenes. The possible combinations of these minerals are endless.

The natural treasure can be found within the Pictured Rocks National Lakeshore. Sand Point Beach turns pink as garnet in the rock layers of the Pictured Rocks cliffs erode away. The garnet is ...