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Crystal Mountain is Colorado's northern most pegmatite area and located just a short distance west of Fort Collins. It can be reached by driving 20 miles west from Fort Collins along county road 38E past horsetooth resevoir, and taking county road 27 (stove prairie road). Crystal Mountain is actually one of the eastern ridges of 10,262' Lookout Mountain.
This is a great place to look for books of muscovite mica containing Beryl crystals, some as long as 2 inches have been found at this location.
Crystal Mountain is Colorado's best location for collecting apple green chrysoberyl, which occurs in up to one inch wide contact twins usually associated with small "books" of Muscovite mica. Columbite tantalite crystals are as long as two inches. Beryl the most common accessory mineral, occurs in light greens, blues and whites. Some un-named Beryl miners in this area have reported crystals of one foot in diameter and six feet long!
Collectors have found colorless topaz in terminated crystals up to four inches in length. Some other interesting minerals that are found in the Crystal Mountain Pegmatites include albite, bismuthinite, fluorite, spessartine garnets, scheelite, spodumene, lepidolite, zircon and utanite.