Zircon

specimen number:
2063823

location:
St. Peters Dome, El Paso Co., Colorado, USA

description:
Good cluster of sharply formed lustrous brown zircon crystals, the largest measuring to 0.8 cm in size. In great condition, said to have been collected in 1978.

St. Peters Dome, located in El Paso County near Colorado Springs, sits within the western margin of the Pikes Peak batholith, a massive Precambrian granite pluton. The region is world-famous for its complex granitic pegmatites and miarolitic cavities formed during the final cooling stages of magma nearly one billion years ago. Mining activity in the late nineteenth and early twentieth centuries targeted small-scale deposits of fluorite and radioactive minerals, but the area gained far greater historical fame among mineral collectors. The granite pockets of St. Peters Dome produced exceptional, highly sought-after specimens including sharp riebecktite crystals, lustrous astrophyllite blades, zircon, cryolite, clear quartz, and vivid green fluorite. Mineralogists and field collectors have explored the rugged slopes of the dome for over a century, making it one of the premier classic mineral localities in the Front Range of Colorado.

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