Madagascar Septarian Spheres | In Select Sizes

These Curator's Choice Madagascar Septarian spheres, showcase the unique geological formation of septarian nodules. Originating from sedimentary rocks in regions like Utah, Madagascar, or Morocco, these spheres are composed of calcite, aragonite, and limestone. Their characteristic cracked patterns result from mineral deposits filling the natural shrinkage cracks formed as ancient mud balls dried. Ideal for collectors and geology enthusiasts, this specimen offers a tangible connection to ancient sea floors and sedimentary processes. You will receive one Septarian sphere in the size range you choose, similar to those pictured, each with its own unique pattern and coloration.