Septarian.
Septarian stones are unique in that they were formed as a result of volcanic eruptions and attracted dead sea life chemically bonding them to the sediment and forming mud balls. They are composed of Calcite, which makes up the yellow centres and Aragonite, which are the brown lines. The outer grey rock is limestone. 
Septarian (also called the dragon stone) gives you confidence and is a grounding stone, allows for better tolerance and patience, as well as emotional flexibility.  
Septarian is a healing stone beneficial to overall health and wellbeing.
 All our crystals are high-energy, high-quality, ethically sourced stones.