Prehnite casts after Anhydrite with CalciteWonderfully gemmy, spherical light green Prehnite casts after Anhydrite with several, off white color, gemmy scalenohedral Calcite crystals. A few of the Calcites are twinned, and for the most part, the piece is great shape from the standpoint of quality. 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 impressive display specimens, including some

It is not a simple twin consisting of two blades

as it has an interesting chemistry

According to the information online

Specimen #PREH3118

It almost feels like it could be alive if you look at it just right

No damage to the display side

Specimen# GEMXL71518

this is an important and unusual piece that would make a great addition to any collection

lustrous blades measuring up to 1

but under halogen lighting they are a fine silvery-blue color

From a find at the lesser known Rudna Mine in Poland

I will say that this is certainly one of the better crystal groups from this find