Aragonite is a crystal form of calcium carbonate, formed by precipitation from marine or freshwater environments. The crystal structure often has repeated "twinning" which creates the hexagonal rods you see here. As they form on top of one another they often create an orbicular or star shape. These clusters are from Morocco.
The star cluster formation is especially powerful because of its capacity to balance, unblock, and heal the emotional body.
This listing is for (1) Aragonite cluster 1"-2", similar to those pictured.