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Saint David area, Cochise County, Arizona, USAi
Regional Level Types
Saint David areaArea
Cochise CountyCounty
ArizonaState
USACountry

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Latitude & Longitude (WGS84):
31° 51' 56'' North , 110° 15' 22'' West
Latitude & Longitude (decimal):
Type:
Mindat Locality ID:
134557
Long-form identifier:
mindat:1:2:134557:8
GUID (UUID V4):
02a2b6f5-7c37-4466-9bb6-64d8e1aa3dee


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.

Most gypsum deposits are on the West side of the San Pedro River, two to three miles from the river, in the canyons that come down from the plateau above the river plain. Forms of the gypsum vary from the compact rose form to platy crystals, to colorless crystals and many other forms, each canyon seems to have different forms of gypsum.
A recent discovery in 2023 is that the mineral whewellite is present in at least 8 samples of different species of cacti in the St. David area, each having the crystals inside dead tissue of the plants.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded from this region.


Mineral List

Mineral list contains entries from the region specified including sub-localities

15 valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

Rock list contains entries from the region specified including sub-localities

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

β“˜ Aragonite
Formula: CaCO3
β“˜ Calcite
Formula: CaCO3
β“˜ 'Desert Rose'
β“˜ Fluorite
Formula: CaF2
β“˜ Grossular
Formula: Ca3Al2(SiO4)3
β“˜ Gypsum
Formula: CaSO4 · 2H2O
β“˜ Gypsum var. Satin Spar Gypsum
Formula: CaSO4 · 2H2O
β“˜ Gypsum var. Selenite
Formula: CaSO4 · 2H2O
β“˜ Hematite
Formula: Fe2O3
β“˜ Hematite var. Specularite
Formula: Fe2O3
β“˜ Magnetite
Formula: Fe2+Fe3+2O4
β“˜ Microcline
Formula: K(AlSi3O8)
β“˜ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
β“˜ Nitratine
Formula: NaNO3
β“˜ Opal
Formula: SiO2 · nH2O
β“˜ Orthoclase
Formula: K(AlSi3O8)
β“˜ Pyrrhotite
Formula: Fe1-xS
β“˜ Quartz
Formula: SiO2
β“˜ Quartz var. Chalcedony
Formula: SiO2
β“˜ Quartz var. Milky Quartz
Formula: SiO2
β“˜ 'Tourmaline'
Formula: AD3G6 (T6O18)(BO3)3X3Z
β“˜ Whewellite
Formula: Ca(C2O4) · H2O

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
β“˜Pyrrhotite2.CC.10Fe1-xS
Group 3 - Halides
β“˜Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
β“˜Magnetite4.BB.05Fe2+Fe3+2O4
β“˜Hematite
var. Specularite
4.CB.05Fe2O3
β“˜4.CB.05Fe2O3
β“˜Quartz
var. Chalcedony
4.DA.05SiO2
β“˜var. Milky Quartz4.DA.05SiO2
β“˜4.DA.05SiO2
β“˜Opal4.DA.10SiO2 Β· nH2O
Group 5 - Nitrates and Carbonates
β“˜Calcite5.AB.05CaCO3
β“˜Aragonite5.AB.15CaCO3
β“˜Nitratine5.NA.05NaNO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
β“˜Gypsum
var. Selenite
7.CD.40CaSO4 Β· 2H2O
β“˜7.CD.40CaSO4 Β· 2H2O
β“˜var. Satin Spar Gypsum7.CD.40CaSO4 Β· 2H2O
Group 9 - Silicates
β“˜Grossular9.AD.25Ca3Al2(SiO4)3
β“˜Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
β“˜Orthoclase9.FA.30K(AlSi3O8)
β“˜Microcline9.FA.30K(AlSi3O8)
Group 10 - Organic Compounds
β“˜Whewellite10.AB.45Ca(C2O4) Β· H2O
Unclassified
β“˜'Tourmaline'-AD3G6 (T6O18)(BO3)3X3Z
β“˜'Desert Rose'-

List of minerals for each chemical element

HHydrogen
Hβ“˜ GypsumCaSO4 · 2H2O
Hβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Hβ“˜ OpalSiO2 · nH2O
Hβ“˜ WhewelliteCa(C2O4) · H2O
Hβ“˜ Gypsum var. SeleniteCaSO4 · 2H2O
Hβ“˜ Gypsum var. Satin Spar GypsumCaSO4 · 2H2O
BBoron
Bβ“˜ TourmalineAD3G6 (T6O18)(BO3)3X3Z
CCarbon
Cβ“˜ AragoniteCaCO3
Cβ“˜ CalciteCaCO3
Cβ“˜ WhewelliteCa(C2O4) · H2O
NNitrogen
Nβ“˜ NitratineNaNO3
OOxygen
Oβ“˜ AragoniteCaCO3
Oβ“˜ CalciteCaCO3
Oβ“˜ Quartz var. ChalcedonySiO2
Oβ“˜ GrossularCa3Al2(SiO4)3
Oβ“˜ GypsumCaSO4 · 2H2O
Oβ“˜ HematiteFe2O3
Oβ“˜ MagnetiteFe2+Fe23+O4
Oβ“˜ MicroclineK(AlSi3O8)
Oβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Oβ“˜ NitratineNaNO3
Oβ“˜ OpalSiO2 · nH2O
Oβ“˜ OrthoclaseK(AlSi3O8)
Oβ“˜ QuartzSiO2
Oβ“˜ TourmalineAD3G6 (T6O18)(BO3)3X3Z
Oβ“˜ WhewelliteCa(C2O4) · H2O
Oβ“˜ Gypsum var. SeleniteCaSO4 · 2H2O
Oβ“˜ Hematite var. SpeculariteFe2O3
Oβ“˜ Quartz var. Milky QuartzSiO2
Oβ“˜ Gypsum var. Satin Spar GypsumCaSO4 · 2H2O
FFluorine
Fβ“˜ FluoriteCaF2
NaSodium
Naβ“˜ NitratineNaNO3
AlAluminium
Alβ“˜ GrossularCa3Al2(SiO4)3
Alβ“˜ MicroclineK(AlSi3O8)
Alβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Alβ“˜ OrthoclaseK(AlSi3O8)
SiSilicon
Siβ“˜ Quartz var. ChalcedonySiO2
Siβ“˜ GrossularCa3Al2(SiO4)3
Siβ“˜ MicroclineK(AlSi3O8)
Siβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Siβ“˜ OpalSiO2 · nH2O
Siβ“˜ OrthoclaseK(AlSi3O8)
Siβ“˜ QuartzSiO2
Siβ“˜ Quartz var. Milky QuartzSiO2
SSulfur
Sβ“˜ GypsumCaSO4 · 2H2O
Sβ“˜ PyrrhotiteFe1-xS
Sβ“˜ Gypsum var. SeleniteCaSO4 · 2H2O
Sβ“˜ Gypsum var. Satin Spar GypsumCaSO4 · 2H2O
KPotassium
Kβ“˜ MicroclineK(AlSi3O8)
Kβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Kβ“˜ OrthoclaseK(AlSi3O8)
CaCalcium
Caβ“˜ AragoniteCaCO3
Caβ“˜ CalciteCaCO3
Caβ“˜ FluoriteCaF2
Caβ“˜ GrossularCa3Al2(SiO4)3
Caβ“˜ GypsumCaSO4 · 2H2O
Caβ“˜ WhewelliteCa(C2O4) · H2O
Caβ“˜ Gypsum var. SeleniteCaSO4 · 2H2O
Caβ“˜ Gypsum var. Satin Spar GypsumCaSO4 · 2H2O
FeIron
Feβ“˜ HematiteFe2O3
Feβ“˜ MagnetiteFe2+Fe23+O4
Feβ“˜ PyrrhotiteFe1-xS
Feβ“˜ Hematite var. SpeculariteFe2O3

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
Story of Whewellite in Cochise County Arizona by Rolf Luetcke


Localities in this Region

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References

 
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