Hydroxylapophyllite-K with Prehnite, Laumontite

specimen number:
2063756

location:
Virginia Trap Rock Quarry, Loudoun Co., Virginia, USA

description:
A sharp pseudo-cubic lustrous colorless partly gemmy crystal of hydroxylapophyllite-K measuring 1.2 cm on edge set on a matrix covered by light green crystallized prehnite. White colorless laumontite is scattered throughout. The specimen comes with a previous label from the Reger collection. In good condition.

The Virginia Trap Rock Quarry, located in Loudoun County, Virginia, is a world-renowned mineral locality situated within the Culpeper Basin of the Newark Supergroup. This active aggregate quarry exposes massive Triassic to Jurassic diabase, a fine-grained igneous rock that intruded into surrounding sedimentary strata. As this large igneous body cooled, low-temperature hydrothermal fluids circulated through fractures, joints, and cavities, precipitating a rich variety of secondary minerals.

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