Calcite

specimen number:
2063799

location:
Jose Maria Patoni, San Juan del Rio, Durango, Mexico

description:
A colorless gem quality glassy and lustrous sharply formed crystal of calcite without matrix. Naturally crystallized all around and in great condition. Fluorescent. This was collected by Matthias Jurgiets in the late 1990s. The specimen comes with a previous label from the collection of Ray DeMark.

The mining locality of Jose Maria Patoni in San Juan del Rio, Durango, Mexico, is part of a historic mining region with localized mineral workings whose exact individual opening and closing dates are not precisely documented, though regional mining activity expanded heavily through the 19th and 20th centuries. Geologically, the area is characterized by volcanic and sedimentary host rocks associated with regional hydrothermal vein systems that produce various metallic and non-metallic mineral specimens. Within these local cavities and veins, collectors have found exceptional specimens of calcite, often appearing as water-clear, transparent crystals with complex, highly modified habits and distinct ultraviolet fluorescence.

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