Prehnite

specimen number:
2063631

location:
Reed's Gap Quarry, Durham, Middlesex Co., Connecticut, USA

description:
Sparkling pale green botryoidal crystallized prehnite covering the top of matrix. In good condition. The specimen comes with a previous label from the collection of Ray DeMark.

Located in Durham, Middlesex County, Connecticut, Reeds Gap Quarry is a well-known mineral locality set within the Jurassic-aged trap rock formations of the Hartford Basin. The geology of the site is defined by basaltic lava flows and intrusive diabase sheets that underwent extensive hydrothermal alteration, creating mineral-rich pockets and cavities within the dark volcanic rock. Historically mined for crushed stone and road aggregate, the quarry gained fame among mineral collectors for yielding exceptionally fine mineral specimens preserved in these altered zones. Collectors particularly prize the locality for its outstanding prehnite, a calcium aluminum silicate mineral that occurs as lustrous light green to yellow-green botryoidal masses, radiating crystalline aggregates, and translucent hemisphere formations often associated with quartz, calcite, and zeolites.

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