A 108 bead mala is the most ancient form of a rosary, used to count the repetitions of a mantra, a prayer, as the spiritual self is trained. Each Japamala should only be used for repetitions of one particular mantra.
Hematite is grounding and can be useful for a mental “tune up”. It helps studying by enhancing memory and concentration. It dissipates negativity energy and stimulates the circulatory system.