Septaria Nodule Geode from USA

Large nudule in Septaria Geode of Calcite golden yellow.
 
 She is from the south of Utha, USA .
 It is an XL size museum piece.
 Size: 25.5cm by 22cm by 10.5cm for 5kg990
 
 Wikipedia definition:
 A septaria is a desiccation nodule that can be found in the Oxfordian black soils in the pre-Alps in particular. These are nodules which crystallize around a nucleus and which can precipitate pure silica, giving pure and automorphic quartz or Calcite .