This listing is for one Septarian tumbled stone from Madagascar. See photo for size. Medium are up to 1.25 inches, Large are over 1.25 inches.
We will handpick one palm stone for you.
Septarian nodules 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 centers and Aragonite which are the brown lines. The outer grey rock is Limestone.