Pyromorphite

specimen number:
2102228

location:
Wheatley Mine, Phoenixville, Pennsylvania, USA

description:
Rich micro crystals of pyromorphite across most of this breccia matrix. Minimal micro-damage present, good large example for this old locality and species.

The Wheatley Mine, located in the Phoenixville mining district of Chester County, Pennsylvania, is a legendary locality for secondary lead and zinc minerals. Geologically, it is part of a series of hydrothermal vein deposits that cut through Precambrian gneiss and Triassic sedimentary rocks within the Newark Basin. These veins formed as mineral-rich fluids deposited galena and sphalerite, which later underwent extensive oxidation to produce a diverse suite of colorful minerals, most notably the world-class green and yellow pyromorphite for which the site is famous. Historically, the mine was opened in 1850 by Charles M. Wheatley and operated primarily during two distinct periods: the initial peak from 1850 to 1855 and a subsequent attempt at reactivation in the early 1900s. Though the mine was worked for lead and silver, its enduring legacy lies in the aesthetic quality of its specimens, which are now featured in major museum collections globally. Today, the mine site is closed and largely reclaimed, but Wheatley Mine pyromorphite remains the gold standard for the species in North America.

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