Aktinit is a mineral that primarily consists of uranium and is known for its radioactive properties. It is part of the uraninite group and is often found in granitic rocks and pegmatites. Due to its radioactivity, it is of interest in the fields of geology and nuclear energy. The mineral is typically dark in color and can appear in various forms, including granular or massive. Aktinit is also associated with other minerals like thorite and monazite, which can contain valuable rare earth elements. Its study helps scientists understand the processes of mineral formation and the behavior of radioactive materials in the environment.