Prehnite (ex Brian Kosnar Collection)

Item Description

This (along with its Upper New Street counterpart) is one of the most famous Trap Rock quarries in New Jersey and is probably most famous for its amazing and unique Prehnite casts or epimorphs after Anhydrite (sometimes called "fingers" or "snakeheads"). This specimen features casts, of spherical aggregates of pale green Prehnite after Anhydrite. A great Trap Rock display specimen from this significant New Jersey locality. According to mindat.org, Lower New Street is a trap rock quarry in Watchung Basalt worked between 1900 and 1936. The New Street quarries exploited an area of the basalt that was extruded over a probable shallow wetland or lake, thus the lava cooled in pillows. The large interstitial spaces between the pillows yielded superb minerals.