Prehnite finger cast after Anhydrite Cerite and this one is distinctive

and this one is distinctive because it formed in a three-dimensional cluster with attractive

These Calcite crystals occur in septarian nodules found in the Mancos shale formation

The famous Camp Bird Mine

the word copal is used to describe a hardened resinous substance which is found in an intermediate stage of hardening and polymerization between softer / "gummier" resins and amber

and the faces on the Magnetite crystals are rather smooth and shiny

Prehnite finger cast after Anhydrite Cerite and this one is distinctiveA classic, single finger shaped cast of Prehnite after Anhydrite with good luster on the display side, and a slight coating of a secondary clay mineral on the back. The underside of the piece shows the square cross section of the once preexisting Anhydrite crystal that was the base for the cast. The Prospect Park Quarry is arguably the most famous mineral producing basalt quarry in New Jersey and, for over a century, has provided collectors with