Prehnite finger cast after Anhydrite

Prehnite finger cast after AnhydriteA pair of classic finger shaped casts 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 crystals that were 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

This locality in the Cripple Creek District (purportedly in an old mine shaft) produced unique epimorphs or "casts" of Smoky Quartz and Chalcedony replacing Laumontite

perhaps to protect their discovery from "poachers"

This particular specimen it is a superb display piece featuring very good quality

sometimes quite heavily

It's not completely unstable like decomposing Limonite and it provides a much more appealing contrast than ordinary Pyrite

This piece features the rare association of Pyrargyrite with Miargyrite in the form of brilliantly splendent

sharpness and gemminess

This locality has produced what must be the finest twinned Ferberite crystals extant

I’ve never seen a specimen quite like this from this locality

which Atacamite does not

the piece presents something different every 90 degrees it's turned

but its remarkable gemminess