Celestine

specimen number:
2063847

location:
Mackville quarry, Outagamie Co., Wisconsin, USA

description:
A neat thumbnail for the species from an unusual locality. A pale blue partly gemmy lustrous sharply formed loose single crystal of Celestine. In great condition.

The Mackville Quarry, located near Appleton in Outagamie County, Wisconsin, exposes Middle Ordovician dolomite of the Sinnipee Group that developed within ancient shallow marine reef and lagoonal environments. Mineralization occurred as hydrothermal fluids circulated through localized fractures, solution cavities, and vugs in the carbonate host rock, precipitating secondary minerals during regional post-depositional events. Historically operated to produce crushed stone and aggregate for local construction, the quarry gained notoriety among regional collectors for producing exceptional mineral specimens from these open pockets. It is particularly renowned for its celestine, which forms sharp, transparent to pale blue tabular crystals and fan-like sprays perched on matrix, often intimately associated with calcite, marcasite, and pyrite.

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