Description
Here is another one of these specimens where you get to choose. Pumpellyite or Prehnite specimen? The previous owner called it a Prehnite specimen when he added the piece to his collection in 1958 (see handwritten label that comes with the specimen). However, the specimen is also abundantly covered in the rare hydrous calcium silicate Pumpellyite from the abandoned diabase quarry Rauschermühle.