Septarian is one of my favorite stones (and a guy fave, as well - at least among the men in my life). Septarian is a concretion stone. It's formed when rock and sand gets replaced with other minerals replace those dissolved away (these guys are found in places that used to be covered in water). Septarian is a stone for communication and privacy, and also contains the properties of calcite and aragonite, as those are two of the minerals included in it.
This septarian egg also has some small calcite crystals forming on it.
This listing is for one (1) septarian egg, approximately 92mm tall and 416 grams. You will receive the exact stone shown.