These approximately ping pong ball sized chalcedony nodule stones are a microcrystalline type of quartz occurring in several different forms. Chalcedony nodules and botryoidal clusters are formed oftiny fibres that radiate outwards from the center of the crystal. This will give you an indication of how the energy of the crystal flows through the body. Chalcedony is a gemstone that is said to read people's feelings. It has been also called "a telepathy gemstone." It will be useful to understand true feelings under the words and great to use when you want to avoid a conflict of opinions. It would give you power during important negotiations or persuasion. These are around ping pong sized, however, exact sizes vary and each one is unique.