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Saint David area, Cochise Co., Arizona, USA

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Latitude & Longitude (WGS84): 31° 54' 15'' North , 110° 12' 49'' West
Latitude & Longitude (decimal): 31.9041666667, -110.213611111
Other regions containing this locality:Sonoran Desert, North America

The St. David area is an alluvial outflow from the Whetstone Mountains to the West. At the San Pedro River in the center of the valley the alluvial deposits are up to fifteen hundred feet in depth.
Subsequent erosion cut through layers of soil, exposing the various deposition levels.
Soil saturation of rainwater and subsequent evaporation allowed deposition of gypsum in many forms. Opal also formed in the same way above impervious layers of caliche or clays.
Quartz, magnetite, garnet, iron and other minerals are found in the outflow washes. Some of the opal and silica pods are slightly radioactive from the marginally commercial deposits in the Whetstone Mountains.

Mindat Articles

Fluorescent Common Opal of St. David, Arizona by Rolf Luetcke
Pseudomorph Crystal Discovery by Rolf Luetcke
Saint David Gypsum Collecting by Rolf Luetcke

Mineral List

12 valid minerals.

Rock Types Recorded

Entries shown in red are rocks recorded for this region.

Note: this is a very new system on and data is currently VERY limited. Please bear with us while we work towards adding this information!

The above list contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Mitchell (2001), Gem Trails of Arizona.

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