Septarian - Utah - 100 poundsLocality: Utah, USA Color: Septarian nodules often display a unique combination of colors, including shades of yellow, brown, gray, and occasionally white. Hardness: The hardness of septarian nodules varies depending on the minerals present in the concretion. Calcite, for example, has a hardness of around 3 on the Mohs scale, while aragonite is slightly harder at around 3. 5 to 4. Clarity: Septarian nodules typically have a relatively low clarity due