Shop for Pyrite 6 Faceted With Silver Chain Pendulums. Pyrite is a powerful protection stone which shields and protects against all forms of negative vibrations and/or energy, working on the physical, etheric, and emotional levels. It stimulates the intellect and enhances memory, helping to recall relevant information when needed. Pendulums are used to regulate the movement of clocks because the interval of time for each complete oscillation, called the period, is constant. Visit us today at Natural Agate.