Lusardi, B.A.2010-03-152010-03-152020; 2000https://hdl.handle.net/11299/59443Short summary of the common rocks found in Minnesota. First published in 2000. Updated 8/2020 and provided in PDF format with a 2 page or 4 page print options.Rocks are made up of minerals. A mineral is naturally occurring and inorganic, and has a distinct chemical formula and crystal structure. When minerals form in open spaces, their crystal form is apparent. However, most minerals occur in an interlocking network with other minerals to form different kinds of rocks. There are three basic kinds of rocks—igneous, metamorphic, and sedimentary. Varieties of all three can be found in Minnesota.engeologycommon rocksMinnesota Geological SurveymineralsReport