Calcite

specimen number:
2063794

location:
Walker vein, Caldwell Stone Co. Quarry, Boyle Co., Kentucky, USA

description:
A grouping of colorless gemmy lustrous double terminated scalenohedral calcite crystals without matrix. This is in good condition all around with very minimal micro-damage present. Slight crystallized barite attached on one place on what I consider the back of the piece. Collected by Bill Mackenzie in the late 1990s. The specimen comes with a previous label from the collection of Ray DeMark.

Located in Boyle County near Danville, Kentucky, the Caldwell Stone Company Quarry exposes high-grade Middle Ordovician limestone that hosts the famous Walker vein. This prominent barite-fluorite structural vein formed through low-temperature hydrothermal fluid movement along faults and fractures within the Lexington Limestone. Active quarrying operations opened access to these mineralized zones, making the locality famous among mineral collectors for producing spectacular crystallographic specimens. The Walker vein is particularly renowned for yielding well-formed, pale yellow to color-zoned fluorite cubes, bladed white to cream barite clusters, lustrous dark sphalerite crystals, and occasional calcite. Because active commercial quarrying continually exposed fresh pockets throughout the mid-to-late twentieth century, specimens from the Walker vein stand as classic representatives of Central Kentucky Mineral District mineralization.

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