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Eureka Tunnel (1-15 pegmatite), St Peters Dome, Cheyenne Mining District (St. Peters Dome Mining District), El Paso County, Colorado, USA i
Regional Level Types
Eureka Tunnel (1-15 pegmatite) Tunnel
St Peters Dome Dome
Cheyenne Mining District (St. Peters Dome Mining District) Mining District
El Paso County County
Colorado State
USA Country

Regional Level Types
Eureka Tunnel (1-15 pegmatite)	Tunnel
St Peters Dome	Dome
Cheyenne Mining District (St. Peters Dome Mining District)	Mining District
El Paso County	County
Colorado	State
USA	Country

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Eureka Tunnel entrance, 8 July 2020

Eureka Tunnel, St Peters Dome, Cheyenne Mining District, El Paso County, Colorado, USA

View within the tunnel.

Eureka Tunnel, St Peters Dome, Cheyenne Mining District, El Paso County, Colorado, USA

A view outside from inside Eureka Tunnel

Eureka Tunnel, St Peters Dome, Cheyenne Mining District, El Paso County, Colorado, USA

Eureka Tunnel entrance, 8 July 2020

Eureka Tunnel, St Peters Dome, Cheyenne Mining District, El Paso County, Colorado, USA

View within the tunnel.

Eureka Tunnel, St Peters Dome, Cheyenne Mining District, El Paso County, Colorado, USA

A view outside from inside Eureka Tunnel

Eureka Tunnel, St Peters Dome, Cheyenne Mining District, El Paso County, Colorado, USA

Eureka Tunnel entrance, 8 July 2020

Eureka Tunnel, St Peters Dome, Cheyenne Mining District, El Paso County, Colorado, USA

View within the tunnel.

Eureka Tunnel, St Peters Dome, Cheyenne Mining District, El Paso County, Colorado, USA

Latitude & Longitude (WGS84):

38° 45' 6'' North , 104° 54' 15'' West

Latitude & Longitude (decimal):

Type:

Köppen climate type:

BSk : Cold semi-arid (steppe) climate

Nearest Settlements:

Place	Population	Distance
Fort Carson	13,813 (2011)	10.1km
Stratmoor	6,900 (2011)	11.1km
Colorado Springs	456,568 (2017)	11.6km
Manitou Springs	5,334 (2017)	12.0km
Security-Widefield	32,882 (2011)	16.5km

Nearest Clubs:
Local clubs are the best way to get access to collecting localities

Club	Location	Distance
Colorado Springs Mineral Society	Colorado Springs, Colorado	12km
Canon City Geology Club	Canon City, Colorado	45km
Lake George Gem & Mineral club	Lake George, Colorado	47km

Mindat Locality ID:

112802

Long-form identifier:

mindat:1:2:112802:7

GUID (UUID V4):

Commodities (Major) - Fluorine-Fluorite; (Minor) - Zirconium
Development Status: Past Producer

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.

ⓘ Fluorite (Fluorspar)

ⓘ Zircon

Mineral List

18 valid minerals.

Detailed Mineral List:

ⓘ Astrophyllite

Formula: K₂NaFe²⁺₇Ti₂[Si₄O₁₂]₂O₂(OH)₄F

References:

Paul J. Broyles

ⓘ Bertrandite

Formula: Be₄(Si₂O₇)(OH)₂

References:

Gross, E. B., Heinrich, E. Wm. (1966) Petrology and mineralogy of the Mount Rosa area, El Paso and Teller Counties, Colorado. II. Pegmatites. American Mineralogist, 51 (3-4) 299-323

ⓘ Cryolite

Formula: Na₂NaAlF₆

References:

Landes, Kenneth K. (1935) Colorado pegmatites. American Mineralogist, 20 (5) 319-333

Gross, E. B., Heinrich, E. Wm. (1966) Petrology and mineralogy of the Mount Rosa area, El Paso and Teller Counties, Colorado. II. Pegmatites. American Mineralogist, 51 (3-4) 299-323

ⓘ Elpasolite

Formula: K₂NaAlF₆

References:

Gross, E. B., Heinrich, E. Wm. (1966) Petrology and mineralogy of the Mount Rosa area, El Paso and Teller Counties, Colorado. II. Pegmatites. American Mineralogist, 51 (3-4) 299-323

ⓘ Fluorite

Formula: CaF₂

References:

Landes, Kenneth K. (1935) Colorado pegmatites. American Mineralogist, 20 (5) 319-333

Eckel, Edwin Butt; Cobban, Robert R.; Mosburg, Shirley K.; Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.

ⓘ Gearksutite

Formula: Ca[Al(F,OH)₅(H₂O)]

References:

Gross, E. B., Heinrich, E. Wm. (1966) Petrology and mineralogy of the Mount Rosa area, El Paso and Teller Counties, Colorado. II. Pegmatites. American Mineralogist, 51 (3-4) 299-323

ⓘ Hydrokenoralstonite

Formula: Na_0.5(Al,Mg)₂(F,OH)₆ · H₂O

References:

Gross, E. B., Heinrich, E. Wm. (1966) Petrology and mineralogy of the Mount Rosa area, El Paso and Teller Counties, Colorado. II. Pegmatites. American Mineralogist, 51 (3-4) 299-323

ⓘ Kaolinite

Formula: Al₂(Si₂O₅)(OH)₄

References:

Landes, Kenneth K. (1935) Colorado pegmatites. American Mineralogist, 20 (5) 319-333

ⓘ Microcline

Formula: K(AlSi₃O₈)

References:

Landes, Kenneth K. (1935) Colorado pegmatites. American Mineralogist, 20 (5) 319-333

ⓘ Nacrite

Formula: Al₂(Si₂O₅)(OH)₄

References:

Eckel, Edwin Butt; Cobban, Robert R.; Mosburg, Shirley K.; Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.

ⓘ Pachnolite

Formula: NaCa[AlF₆] · H₂O

References:

Landes, Kenneth K. (1935) Colorado pegmatites. American Mineralogist, 20 (5) 319-333

Gross, E. B., Heinrich, E. Wm. (1966) Petrology and mineralogy of the Mount Rosa area, El Paso and Teller Counties, Colorado. II. Pegmatites. American Mineralogist, 51 (3-4) 299-323

Eckel, Edwin Butt; Cobban, Robert R.; Mosburg, Shirley K.; Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.

ⓘ Prosopite

Formula: CaAl₂F₄[(OH)_4-xF_x]

References:

Landes, Kenneth K. (1935) Colorado pegmatites. American Mineralogist, 20 (5) 319-333

Gross, E. B., Heinrich, E. Wm. (1966) Petrology and mineralogy of the Mount Rosa area, El Paso and Teller Counties, Colorado. II. Pegmatites. American Mineralogist, 51 (3-4) 299-323

Eckel, Edwin Butt; Cobban, Robert R.; Mosburg, Shirley K.; Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.

ⓘ Quartz

Formula: SiO₂

References:

Landes, Kenneth K. (1935) Colorado pegmatites. American Mineralogist, 20 (5) 319-333

ⓘ Quartz var. Chalcedony

Formula: SiO₂

References:

Landes, Kenneth K. (1935) Colorado pegmatites. American Mineralogist, 20 (5) 319-333

ⓘ Riebeckite

Formula: ◻[Na₂][Fe²⁺₃Fe³⁺₂]Si₈O₂₂(OH)₂

References:

Landes, Kenneth K. (1935) Colorado pegmatites. American Mineralogist, 20 (5) 319-333

ⓘ Rutile

Formula: TiO₂

References:

Eckel, Edwin Butt; Cobban, Robert R.; Mosburg, Shirley K.; Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.

ⓘ Thomsenolite

Formula: NaCa[AlF₆] · H₂O

References:

Gross, E. B., Heinrich, E. Wm. (1966) Petrology and mineralogy of the Mount Rosa area, El Paso and Teller Counties, Colorado. II. Pegmatites. American Mineralogist, 51 (3-4) 299-323

Eckel, Edwin Butt; Cobban, Robert R.; Mosburg, Shirley K.; Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.

ⓘ Weberite

Formula: Na₂Mg[AlF₆]F

References:

Gross, E. B., Heinrich, E. Wm. (1966) Petrology and mineralogy of the Mount Rosa area, El Paso and Teller Counties, Colorado. II. Pegmatites. American Mineralogist, 51 (3-4) 299-323

Eckel, Edwin Butt; Cobban, Robert R.; Mosburg, Shirley K.; Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.

ⓘ Zircon

Formula: Zr(SiO₄)

References:

Gross, E. B., Heinrich, E. Wm. (1966) Petrology and mineralogy of the Mount Rosa area, El Paso and Teller Counties, Colorado. II. Pegmatites. American Mineralogist, 51 (3-4) 299-323

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 3 - Halides
ⓘ	Fluorite	3.AB.25	CaF₂
ⓘ	Cryolite	3.CB.15	Na₂NaAlF₆
ⓘ	Elpasolite	3.CB.15	K₂NaAlF₆
ⓘ	Weberite	3.CB.25	Na₂Mg[AlF₆]F
ⓘ	Pachnolite	3.CB.40	NaCa[AlF₆] · H₂O
ⓘ	Thomsenolite	3.CB.40	NaCa[AlF₆] · H₂O
ⓘ	Gearksutite	3.CC.05	Ca[Al(F,OH)₅(H₂O)]
ⓘ	Prosopite	3.CD.10	CaAl₂F₄[(OH)_4-xF_x]
ⓘ	Hydrokenoralstonite	3.CF.05	Na_0.5(Al,Mg)₂(F,OH)₆ · H₂O
Group 4 - Oxides and Hydroxides
ⓘ	Quartz var. Chalcedony	4.DA.05	SiO₂
ⓘ		4.DA.05	SiO₂
ⓘ	Rutile	4.DB.05	TiO₂
Group 9 - Silicates
ⓘ	Zircon	9.AD.30	Zr(SiO₄)
ⓘ	Bertrandite	9.BD.05	Be₄(Si₂O₇)(OH)₂
ⓘ	Astrophyllite	9.DC.05	K₂NaFe²⁺₇Ti₂[Si₄O₁₂]₂O₂(OH)₄F
ⓘ	Riebeckite	9.DE.25	◻[Na₂][Fe²⁺₃Fe³⁺₂]Si₈O₂₂(OH)₂
ⓘ	Kaolinite	9.ED.05	Al₂(Si₂O₅)(OH)₄
ⓘ	Nacrite	9.ED.05	Al₂(Si₂O₅)(OH)₄
ⓘ	Microcline	9.FA.30	K(AlSi₃O₈)

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Astrophyllite	K₂NaFe₇²⁺Ti₂[Si₄O₁₂]₂O₂(OH)₄F
H	ⓘ Bertrandite	Be₄(Si₂O₇)(OH)₂
H	ⓘ Gearksutite	Ca[Al(F,OH)₅(H₂O)]
H	ⓘ Kaolinite	Al₂(Si₂O₅)(OH)₄
H	ⓘ Nacrite	Al₂(Si₂O₅)(OH)₄
H	ⓘ Pachnolite	NaCa[AlF₆] · H₂O
H	ⓘ Prosopite	CaAl₂F₄[(OH)_4-xF_x]
H	ⓘ Hydrokenoralstonite	Na_0.5(Al,Mg)₂(F,OH)₆ · H₂O
H	ⓘ Riebeckite	◻[Na₂][Fe₃²⁺Fe₂³⁺]Si₈O₂₂(OH)₂
H	ⓘ Thomsenolite	NaCa[AlF₆] · H₂O
Be	Beryllium
Be	ⓘ Bertrandite	Be₄(Si₂O₇)(OH)₂
O	Oxygen
O	ⓘ Astrophyllite	K₂NaFe₇²⁺Ti₂[Si₄O₁₂]₂O₂(OH)₄F
O	ⓘ Bertrandite	Be₄(Si₂O₇)(OH)₂
O	ⓘ Quartz var. Chalcedony	SiO₂
O	ⓘ Gearksutite	Ca[Al(F,OH)₅(H₂O)]
O	ⓘ Kaolinite	Al₂(Si₂O₅)(OH)₄
O	ⓘ Microcline	K(AlSi₃O₈)
O	ⓘ Nacrite	Al₂(Si₂O₅)(OH)₄
O	ⓘ Pachnolite	NaCa[AlF₆] · H₂O
O	ⓘ Prosopite	CaAl₂F₄[(OH)_4-xF_x]
O	ⓘ Quartz	SiO₂
O	ⓘ Hydrokenoralstonite	Na_0.5(Al,Mg)₂(F,OH)₆ · H₂O
O	ⓘ Riebeckite	◻[Na₂][Fe₃²⁺Fe₂³⁺]Si₈O₂₂(OH)₂
O	ⓘ Rutile	TiO₂
O	ⓘ Thomsenolite	NaCa[AlF₆] · H₂O
O	ⓘ Zircon	Zr(SiO₄)
F	Fluorine
F	ⓘ Astrophyllite	K₂NaFe₇²⁺Ti₂[Si₄O₁₂]₂O₂(OH)₄F
F	ⓘ Cryolite	Na₂NaAlF₆
F	ⓘ Elpasolite	K₂NaAlF₆
F	ⓘ Fluorite	CaF₂
F	ⓘ Gearksutite	Ca[Al(F,OH)₅(H₂O)]
F	ⓘ Pachnolite	NaCa[AlF₆] · H₂O
F	ⓘ Prosopite	CaAl₂F₄[(OH)_4-xF_x]
F	ⓘ Hydrokenoralstonite	Na_0.5(Al,Mg)₂(F,OH)₆ · H₂O
F	ⓘ Thomsenolite	NaCa[AlF₆] · H₂O
F	ⓘ Weberite	Na₂Mg[AlF₆]F
Na	Sodium
Na	ⓘ Astrophyllite	K₂NaFe₇²⁺Ti₂[Si₄O₁₂]₂O₂(OH)₄F
Na	ⓘ Cryolite	Na₂NaAlF₆
Na	ⓘ Elpasolite	K₂NaAlF₆
Na	ⓘ Pachnolite	NaCa[AlF₆] · H₂O
Na	ⓘ Hydrokenoralstonite	Na_0.5(Al,Mg)₂(F,OH)₆ · H₂O
Na	ⓘ Riebeckite	◻[Na₂][Fe₃²⁺Fe₂³⁺]Si₈O₂₂(OH)₂
Na	ⓘ Thomsenolite	NaCa[AlF₆] · H₂O
Na	ⓘ Weberite	Na₂Mg[AlF₆]F
Mg	Magnesium
Mg	ⓘ Hydrokenoralstonite	Na_0.5(Al,Mg)₂(F,OH)₆ · H₂O
Mg	ⓘ Weberite	Na₂Mg[AlF₆]F
Al	Aluminium
Al	ⓘ Cryolite	Na₂NaAlF₆
Al	ⓘ Elpasolite	K₂NaAlF₆
Al	ⓘ Gearksutite	Ca[Al(F,OH)₅(H₂O)]
Al	ⓘ Kaolinite	Al₂(Si₂O₅)(OH)₄
Al	ⓘ Microcline	K(AlSi₃O₈)
Al	ⓘ Nacrite	Al₂(Si₂O₅)(OH)₄
Al	ⓘ Pachnolite	NaCa[AlF₆] · H₂O
Al	ⓘ Prosopite	CaAl₂F₄[(OH)_4-xF_x]
Al	ⓘ Hydrokenoralstonite	Na_0.5(Al,Mg)₂(F,OH)₆ · H₂O
Al	ⓘ Thomsenolite	NaCa[AlF₆] · H₂O
Al	ⓘ Weberite	Na₂Mg[AlF₆]F
Si	Silicon
Si	ⓘ Astrophyllite	K₂NaFe₇²⁺Ti₂[Si₄O₁₂]₂O₂(OH)₄F
Si	ⓘ Bertrandite	Be₄(Si₂O₇)(OH)₂
Si	ⓘ Quartz var. Chalcedony	SiO₂
Si	ⓘ Kaolinite	Al₂(Si₂O₅)(OH)₄
Si	ⓘ Microcline	K(AlSi₃O₈)
Si	ⓘ Nacrite	Al₂(Si₂O₅)(OH)₄
Si	ⓘ Quartz	SiO₂
Si	ⓘ Riebeckite	◻[Na₂][Fe₃²⁺Fe₂³⁺]Si₈O₂₂(OH)₂
Si	ⓘ Zircon	Zr(SiO₄)
K	Potassium
K	ⓘ Astrophyllite	K₂NaFe₇²⁺Ti₂[Si₄O₁₂]₂O₂(OH)₄F
K	ⓘ Elpasolite	K₂NaAlF₆
K	ⓘ Microcline	K(AlSi₃O₈)
Ca	Calcium
Ca	ⓘ Fluorite	CaF₂
Ca	ⓘ Gearksutite	Ca[Al(F,OH)₅(H₂O)]
Ca	ⓘ Pachnolite	NaCa[AlF₆] · H₂O
Ca	ⓘ Prosopite	CaAl₂F₄[(OH)_4-xF_x]
Ca	ⓘ Thomsenolite	NaCa[AlF₆] · H₂O
Ti	Titanium
Ti	ⓘ Astrophyllite	K₂NaFe₇²⁺Ti₂[Si₄O₁₂]₂O₂(OH)₄F
Ti	ⓘ Rutile	TiO₂
Fe	Iron
Fe	ⓘ Astrophyllite	K₂NaFe₇²⁺Ti₂[Si₄O₁₂]₂O₂(OH)₄F
Fe	ⓘ Riebeckite	◻[Na₂][Fe₃²⁺Fe₂³⁺]Si₈O₂₂(OH)₂
Zr	Zirconium
Zr	ⓘ Zircon	Zr(SiO₄)

Other Regions, Features and Areas containing this locality

North AmericaContinent

Rocky MountainsMountain Range

North America PlateTectonic Plate

Great Plains DomainDomain
Southern Rocky MountainsOrogenic Belt

This page contains all mineral locality references listed on mindat.org. 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 mindat.org 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.

References

Landes, Kenneth K. (1935) Colorado pegmatites. American Mineralogist, 20 (5) 319-333

Pearl, Richard M. (1972) Colorado Gem Trails and Mineral Guide (3rd ed.) Sage Books, Denver, CO.

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