Araogonite Arrow Head

The scanned image looks darker only because it is poorly lighted they are the same piece of stone

Is South Eastern South Dakota there is a lot of mineral called araogonite. It typically forms in what is called a septarian nodule. An interesting bit of geological history if you will. Calcite is created by an acid that forms when limestone and water come together. The calcium deposited by ancient sea shells is the material that makes up lime stone. This calcite seeps into the cracks left in the dried mud of an ancient ocean floor. Aragonite is formed when heat and pressure come together to metamorph calcite into something different. Similar to the process that turns carbon into diamond but on a less magnificent scale. Septarian Nodule in a mixture of fossilized mud matrixed with Calcite and aragonite crystal. Kind of ironic in a sense that this rock that I carve is or at least was at one time a seashell. This arrow head is one of the first arrogonite carvings that I have done. I latter went on to add a feather made from beaten copper plate and copper clasp. This also is a favorite of mine and can be purchased for $40.00