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 ArticlesFluorescent Common Opal of St. David, Arizona by Rolf Luetcke
Pseudomorph Crystal Discovery by Rolf Luetcke
Saint David Gypsum Collecting by Rolf Luetcke
12 valid minerals.
Rock Types RecordedEntries shown in red are rocks recorded for this region.
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Mitchell (2001), Gem Trails of Arizona.