Prehnite Finger Casts

Many of the well-known Prehnites from New Jersey form casts (epimorphs - a type of pseudomorphism) whereby preexisting crystals of Anhydrite are coated and later dissolved by the more stable Prehnite, creating hollow cavities. Based on the original shape of the Anhydrite, the Prehnites can sometimes leave unique finger-shaped casts considered to be the most desirable casts from New Jersey.    

Prehnite finger casts after Anhydrite from the Prospect Park Quarry in New Jersey, USA

Prehnite finger casts after Anhydrite from the Prospect Park Quarry in New Jersey, USA

Prehnite finger casts after Anhydrite from the Prospect Park Quarry in New Jersey, USA

Prehnite finger casts after Anhydrite from the Prospect Park Quarry in New Jersey, USA

Prehnite finger casts after Anhydrite from the Prospect Park Quarry in New Jersey, USA

Prehnite finger casts after Anhydrite from the Prospect Park Quarry in New Jersey, USA