5 mi northwest of Canon City (also known as the Royal Gorge district), comprises a pegmatite district of about 10 square mi in T. 18 S., R. 71 W. It is easily reached via U.S. Highway 50 and the Royal Gorge Road from Canon City. ("Minerals of Colorado, updated & revised", p. 15, by Eckel, Edwin B., 1997). Type locality for natromontebrasite, formerly known as fremontite, after the county.
Mineral List:30 entries listed. 24 valid minerals.
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