Prehnite finger cast after Anhydrite Bert S. Butler This amazing “nail head”-shaped crystal

This amazing “nail head”-shaped crystal was caused due to hydrothermal etching in the pocket after the crystal had formed

The most desirable combination / association from this area is to find Brookite on Quartz

not only from Bolivia

where it grew against the pocket wall

This blue shade is rather rare in my experience with this material

Prehnite finger cast after Anhydrite Bert S. Butler This amazing “nail head”-shaped crystalAn eye catching small miniature sized specimen with a few thick, lustrous, gemmy, pleasing green color casts of Prehnite after Anhydrite. The piece has good balance and displays well from a few angles. The reverse side of the piece shows a small cavity where the Anhydrite once grew, proving that the fingers are indeed hollow inside. The Prospect Park Quarry is arguably the most famous mineral producing basalt quarry in New Jersey and, for over a