Hardin County, Illinois, USA


19.5 cm x 26 cm x 6 cm


4,355 g

Description & Provenance

The fluorite found in the Illinois-Kentucky Fluorspar Mining District is a product of geological development that took place approximately 200 million years ago. The area was awash with elementally rich water that flowed through fault lines and fractures within the earth’s surface. By the time it reached the area known today as Illinois and Kentucky, it had cooled to the perfect temperature and was in the ideal environment to crystalize into the mineral species fluorite.

Illinois was an exceptionally prolific producer of fluorspar for the United States of America and was mined from the early 1800s until 1995. It is considered a classic locality among mineral collectors and boasts well saturated fluorites in an array of colors. The area is especially distinctive for its spectacularly zoned fluorites that are rivaled only by occasional finds from the Yaogangxian Mine in China. In fine examples of zoned fluorite from Illinois, the colors are vibrant, and the distinctions between them sharp.

This specimen exhibits exceptionally vivid color and exceptional luster. Yellow is among the rarer colors of the Illinois fluorites, and even when found, yellow specimens tend to be corroded and lusterless. This example is a brilliant, richly saturated, golden yellow with an intense, glassy luster. This stunning yellow fluorite is punctuated by a second generation of smaller, flattened fluorites with a deep magenta coloration. The combination of these two colors is both visually arresting and geologically rare. Few yellow fluorites of this caliber exist, and this one is especially fine for its relatively large size, as well as its well-developed crystal habit. This pristine specimen was acquired in 2013 by Daniel Trinchillo of Fine Minerals International who instantly recognized its eye-catching aesthetics as both exceptional and rare against the thousands of other examples recovered from the classic locality. To emphasize the rarity and importance of this piece, it is notable that not even the Ross C. Lillie collection (the finest collection of fluorites from the region amassed over the course of 40 years and consisting of 2,500 examples) has an example of this type present in the collection.

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