Fluorite

specimen number:
2062563

location:
Ten-Percenter Mine, Teller Co., Colorado, USA

description:
A dark purple semi lustrous octahedral crystal of fluorite set up on a small amount of matrix. In good condition. Collected in the mid 1980s. The specimen comes with a previous label from the collection of Ray DeMark.

The Ten-Percenter Mine (often referenced as the 10 Percenter claim) in Teller County, Colorado, is not a traditional industrial metal mine with a standard commercial production opening and closing date, but rather a famous mineral claim within the Lake George pegmatite district that gained widespread renown for producing exceptional gem specimens, most notably the legendary Key Hole Pocket mined in 1985. Geologically, the deposit is situated within the Proterozoic Pikes Peak batholith, a massive billion-year-old intrusive granite body. Within this host rock, localized pegmatite phases developed volatile-rich miarolitic cavities where gases allowed rare mineral crystals to grow unhindered, yielding the prized blue-green microcline feldspar and associated white albite or smoky quartz that characterize the area.

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