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San Juan Mts, Colorado, USA

San Juan Mts, Colorado, USA

Photo: 2002 John H. Betts
The San Juan Mountains are mostly co-extensive with the San Juan Volcanic field, a large area in southwestern Colorado, roughly triangular in shape, that includes many metal mining areas but also the zeolite producing outcrops west of Wolf Creek Pass. The San Juan Mountains are mostly developed on a huge pile of volcanic rocks including flows, welded tuffs, lahar, etc. that were erupted from many large caldera structures that are scattered throughout the region. Some of the calderas occur in clusters, overlapping or nested within larger structures. The San Juans generally extend from just west of Telluride, near the northwest corner, to the Bonanza area at the northeast corner and then south - southeast past Creede, Platoro and Wolf Creek Pass ending a short distance into New Mexico.

Mineral List

'Albite-Anorthite Series'
Amphibole Supergroup
'Serpentine Group'

20 entries listed. 13 valid minerals.

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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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