Meeves, H.; Harrer, C.M.; Salsbury, M.H.; Konselman, A.S; Shannon, S.S. Jnr. (1966) Reconnaissance of beryllium-bearing pegmatite deposits in six western states: Arizona, Colorado, New Mexico, South Dakota, Utah, and Wyoming. Bureau of Mines Information Circular 8298. United States Department of the Interior 34 pp.p.25 - (Table A-1)

ⓘ 'Petrified Wood'

Localities: Reported from at least 6 localities in this region.

ⓘ 'Plagioclase'

Formula: (Na,Ca)[(Si,Al)AlSi₂]O₈

Locality: Denver Mine, Devils Head Pegmatite Mining District, Douglas County, Colorado, USA

References:

ⓘ Polylithionite

Formula: KLi₂Al(Si₄O₁₀)(F,OH)₂

Locality: Devils Head Pegmatite Mining District, Douglas County, Colorado, USA

References:

Brigatti, Maria Franca; Lugli, Cristina; Poppi, Luciano; Foord, Eugene E.; Kile, Daniel E. (2000) Crystal chemical variations in Li- and Fe-rich micas from Pikes Peak batholith (central Colorado). American Mineralogist, 85 (9). p.1275-1286. doi:10.2138/am-2000-8-920

ⓘ 'Psilomelane'

Locality: Leonard Mine (Franktown), Castle Rock Area, Douglas County, Colorado, USA

References:

(2005) Mineral Resources Data System (MRDS), US Geological Survey.

ⓘ Pyrite

Formula: FeS₂

Locality: Pikes Peak Granite, Douglas County, Colorado, USA

References:

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

ⓘ 'Pyrochlore Group'

Formula: A₂Nb₂(O,OH)₆Z

Localities:

California Mine, Devils Head Pegmatite Mining District, Douglas County, Colorado, USA
Lone Pine Feldspar Quarry (Claim: Lone Pine; MS 20867), Devils Head Pegmatite Mining District, Douglas County, Colorado, USA

ⓘ Pyrolusite

Formula: Mn⁴⁺O₂

Locality: Devils Head Pegmatite Mining District, Douglas County, Colorado, USA

References:

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

ⓘ Quartz

Formula: SiO₂

Localities: Reported from at least 18 localities in this region.

ⓘ Quartz var. Agate

Formula: SiO₂

Locality: Larkspur, Douglas County, Colorado, USA

References:

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

ⓘ Quartz var. Amethyst

Formula: SiO₂

Localities:

Devils Head Pegmatite Mining District, Douglas County, Colorado, USA
Pikes Peak Granite, Douglas County, Colorado, USA

ⓘ Quartz var. Carnelian

Formula: SiO₂

Locality: Larkspur, Douglas County, Colorado, USA

References:

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

ⓘ Quartz var. Chalcedony

Formula: SiO₂

Locality: Larkspur, Douglas County, Colorado, USA

References:

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

ⓘ Quartz var. Citrine

Formula: SiO₂

Locality: Devils Head Pegmatite Mining District, Douglas County, Colorado, USA

References:

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

ⓘ Quartz var. Smoky Quartz

Formula: SiO₂

Localities: Reported from at least 6 localities in this region.

ⓘ Samarskite-(Y)

Formula: YFe³⁺Nb₂O₈

Localities:

Unnamed pegmatite, Devils Head Pegmatite Mining District, Douglas County, Colorado, USA
Devils Head Pegmatite Mining District, Douglas County, Colorado, USA
California Mine, Devils Head Pegmatite Mining District, Douglas County, Colorado, USA ? (more information)

ⓘ Sanidine

Formula: K(AlSi₃O₈)

Locality: Wall Mountain Tuff, Castle Rock Area, Douglas County, Colorado, USA

References:

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

ⓘ Tenorite

Formula: CuO

Localities:

Copper Prospect (MRDS - 10013841), Kassler Area, Douglas County, Colorado, USA
Copper Prospect (MRDS - 10094633), Kassler Area, Douglas County, Colorado, USA

ⓘ Thorite

Formula: Th(SiO₄)

Localities:

Little Eddie Mine, Devils Head Pegmatite Mining District, Douglas County, Colorado, USA
Lost Dutchman pegmatite, Devils Head Pegmatite Mining District, Douglas County, Colorado, USA
Lone Pine Feldspar Quarry (Claim: Lone Pine; MS 20867), Devils Head Pegmatite Mining District, Douglas County, Colorado, USA
Princeton group, Devils Head Pegmatite Mining District, Douglas County, Colorado, USA

ⓘ Topaz

Formula: Al₂(SiO₄)(F,OH)₂

Localities: Reported from at least 6 localities in this region.

ⓘ 'Tourmaline'

Formula: AD₃G₆(T₆O₁₈)(BO₃)₃X₃Z

Localities:

Pine Creek pegmatite area, Douglas County, Colorado, USA
Unnamed Pegmatite, Douglas County, Colorado, USA

ⓘ Xenotime-(Y)

Formula: Y(PO₄)

Locality: Lone Pine Feldspar Quarry (Claim: Lone Pine; MS 20867), Devils Head Pegmatite Mining District, Douglas County, Colorado, USA

References:

ⓘ 'Zinnwaldite'

Locality: Pikes Peak Granite, Douglas County, Colorado, USA

References:

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

ⓘ Zircon

Formula: Zr(SiO₄)

Locality: Devils Head Pegmatite Mining District, Douglas County, Colorado, USA

References:

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

ⓘ Zircon var. Cyrtolite

Formula: Zr[(SiO₄),(OH)₄]

Locality: Devils Head Pegmatite Mining District, Douglas County, Colorado, USA

References:

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

Gallery:

CaF₂ⓘ Fluorite

Fluorite

Devils Head Pegmatite Mining District, Douglas County, Colorado, USA

Fluorite

Devils Head Pegmatite Mining District, Douglas County, Colorado, USA

Fluorite

Devils Head Pegmatite Mining District, Douglas County, Colorado, USA

CaSO₄ · 2H₂Oⓘ Gypsum

Gypsum

Perry Park, Douglas County, Colorado, USA

Gypsum

Perry Park, Douglas County, Colorado, USA

Gypsum

Perry Park, Douglas County, Colorado, USA

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘ	Native Gold	1.AA.05	Au
ⓘ	Native Silver	1.AA.05	Ag
Group 2 - Sulphides and Sulfosalts
ⓘ	Chalcopyrite	2.CB.10a	CuFeS₂
ⓘ	Molybdenite	2.EA.30	MoS₂
ⓘ	Pyrite	2.EB.05a	FeS₂
Group 3 - Halides
ⓘ	Fluorite	3.AB.25	CaF₂
ⓘ	var. Yttrofluorite	3.AB.25	(Ca_1-xY_x)F_2+x where 0.05 < x < 0.3
ⓘ	var. Yttrocerite	3.AB.25	(Ca,Y,Ce)F_2+x
Group 4 - Oxides and Hydroxides
ⓘ	'Pyrochlore Group'	4.00.	A₂Nb₂(O,OH)₆Z
ⓘ	Tenorite	4.AB.10	CuO
ⓘ	Chrysoberyl	4.BA.05	BeAl₂O₄
ⓘ	Hematite	4.CB.05	Fe₂O₃
ⓘ	var. Martite	4.CB.05	Fe₂O₃
ⓘ	Quartz var. Agate	4.DA.05	SiO₂
ⓘ	var. Amethyst	4.DA.05	SiO₂
ⓘ	var. Chalcedony	4.DA.05	SiO₂
ⓘ	var. Citrine	4.DA.05	SiO₂
ⓘ		4.DA.05	SiO₂
ⓘ	var. Smoky Quartz	4.DA.05	SiO₂
ⓘ	var. Carnelian	4.DA.05	SiO₂
ⓘ	Opal	4.DA.10	SiO₂ · nH₂O
ⓘ	Cassiterite	4.DB.05	SnO₂
ⓘ	Pyrolusite	4.DB.05	Mn⁴⁺O₂
ⓘ	Samarskite-(Y)	4.DB.25	YFe³⁺Nb₂O₈
ⓘ	Euxenite-(Y)	4.DG.05	(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)₂O₆
ⓘ	Hollandite	4.DK.05a	Ba(Mn⁴⁺₆Mn³⁺₂)O₁₆
ⓘ	Manganite	4.FD.15	Mn³⁺O(OH)
ⓘ	Carnotite	4.HB.05	K₂(UO₂)₂(VO₄)₂ · 3H₂O
Group 5 - Nitrates and Carbonates
ⓘ	Calcite	5.AB.05	CaCO₃
ⓘ	Malachite	5.BA.10	Cu₂(CO₃)(OH)₂
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘ	Baryte	7.AD.35	BaSO₄
ⓘ	Gypsum var. Alabaster	7.CD.40	CaSO₄ · 2H₂O
ⓘ		7.CD.40	CaSO₄ · 2H₂O
ⓘ	var. Selenite	7.CD.40	CaSO₄ · 2H₂O
ⓘ	var. Satin Spar Gypsum	7.CD.40	CaSO₄ · 2H₂O
ⓘ	Fergusonite-(Y)	7.GA.05	YNbO₄
Group 8 - Phosphates, Arsenates and Vanadates
ⓘ	Xenotime-(Y)	8.AD.35	Y(PO₄)
ⓘ	Conichalcite	8.BH.35	CaCu(AsO₄)(OH)
Group 9 - Silicates
ⓘ	Fayalite	9.AC.05	Fe²⁺₂(SiO₄)
ⓘ	Thorite	9.AD.30	Th(SiO₄)
ⓘ	Zircon	9.AD.30	Zr(SiO₄)
ⓘ	var. Cyrtolite	9.AD.30	Zr[(SiO₄),(OH)₄]
ⓘ	Topaz	9.AF.35	Al₂(SiO₄)(F,OH)₂
ⓘ	Gadolinite-(Y)	9.AJ.20	Y₂Fe²⁺Be₂Si₂O₁₀
ⓘ	Bertrandite	9.BD.05	Be₄(Si₂O₇)(OH)₂
ⓘ	Epidote	9.BG.05a	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
ⓘ	Allanite-(Ce)	9.BG.05b	(CaCe)(AlAlFe²⁺)O[Si₂O₇][SiO₄](OH)
ⓘ	Beryl	9.CJ.05	Be₃Al₂(Si₆O₁₈)
ⓘ	Hedenbergite	9.DA.15	CaFe²⁺Si₂O₆
ⓘ	Hastingsite	9.DE.15	NaCa₂(Fe²⁺₄Fe³⁺)(Si₆Al₂)O₂₂(OH)₂
ⓘ	Polylithionite	9.EC.20	KLi₂Al(Si₄O₁₀)(F,OH)₂
ⓘ	Montmorillonite	9.EC.40	(Na,Ca)_0.33(Al,Mg)₂(Si₄O₁₀)(OH)₂ · nH₂O
ⓘ	Chrysocolla	9.ED.20	Cu_2-xAl_x(H_2-xSi₂O₅)(OH)₄ · nH₂O, x < 1
ⓘ	Microcline var. Amazonite	9.FA.30	K(AlSi₃O₈)
ⓘ		9.FA.30	K(AlSi₃O₈)
ⓘ	Orthoclase	9.FA.30	K(AlSi₃O₈)
ⓘ	Sanidine	9.FA.30	K(AlSi₃O₈)
ⓘ	Albite	9.FA.35	Na(AlSi₃O₈)
ⓘ	var. Oligoclase	9.FA.35	(Na,Ca)[Al(Si,Al)Si₂O₈]
ⓘ	var. Cleavelandite	9.FA.35	Na(AlSi₃O₈)
Unclassified
ⓘ	'Biotite'	-	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
ⓘ	'Clay minerals'	-
ⓘ	'Feldspar Group'	-
ⓘ	'Glauconite'	-	K_0.60-0.85(Fe³⁺,Mg,Al)₂(Si,Al)₄O₁₀](OH)₂
ⓘ	'Heulandite Subgroup'	-	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
ⓘ	'Limonite'	-
ⓘ	'Monazite Group'	-	REE(PO₄)
ⓘ	'Psilomelane'	-
ⓘ	'Tourmaline'	-	AD₃G₆(T₆O₁₈)(BO₃)₃X₃Z
ⓘ	'Zinnwaldite'	-
ⓘ	'Feldspar Group var. Perthite'	-
ⓘ	'Mica Group'	-
ⓘ	'Parisite'	-	Ca(Ce/La/Nd/REE)₂(CO₃)₃F₂
ⓘ	'Petrified Wood'	-
ⓘ	'Plagioclase'	-	(Na,Ca)[(Si,Al)AlSi₂]O₈
ⓘ	'K Feldspar'	-
ⓘ	'Garnet Group'	-	X₃Z₂(SiO₄)₃
ⓘ	'Gadolinite'	-
ⓘ	'Fergusonite'	-
ⓘ	'Chevkinite Group'	-
ⓘ	'Allanite Group'	-	(A1²⁺REE³⁺)(M1³⁺M2³⁺M3²⁺)O[Si₂O₇][SiO₄](OH)

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Gypsum var. Alabaster	CaSO₄ · 2H₂O
H	ⓘ Allanite-(Ce)	(CaCe)(AlAlFe²⁺)O[Si₂O₇][SiO₄](OH)
H	ⓘ Bertrandite	Be₄(Si₂O₇)(OH)₂
H	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
H	ⓘ Carnotite	K₂(UO₂)₂(VO₄)₂ · 3H₂O
H	ⓘ Chrysocolla	Cu_2-xAl_x(H_2-xSi₂O₅)(OH)₄ · nH₂O, x < 1
H	ⓘ Conichalcite	CaCu(AsO₄)(OH)
H	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
H	ⓘ Glauconite	K_0.60-0.85(Fe³⁺,Mg,Al)₂(Si,Al)₄O₁₀](OH)₂
H	ⓘ Gypsum	CaSO₄ · 2H₂O
H	ⓘ Hastingsite	NaCa₂(Fe₄²⁺Fe³⁺)(Si₆Al₂)O₂₂(OH)₂
H	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
H	ⓘ Manganite	Mn³⁺O(OH)
H	ⓘ Malachite	Cu₂(CO₃)(OH)₂
H	ⓘ Montmorillonite	(Na,Ca)_0.33(Al,Mg)₂(Si₄O₁₀)(OH)₂ · nH₂O
H	ⓘ Opal	SiO₂ · nH₂O
H	ⓘ Polylithionite	KLi₂Al(Si₄O₁₀)(F,OH)₂
H	ⓘ Pyrochlore Group	A₂Nb₂(O,OH)₆Z
H	ⓘ Topaz	Al₂(SiO₄)(F,OH)₂
H	ⓘ Zinnwaldite
H	ⓘ Gypsum var. Selenite	CaSO₄ · 2H₂O
H	ⓘ Zircon var. Cyrtolite	Zr[(SiO₄),(OH)₄]
H	ⓘ Gypsum var. Satin Spar Gypsum	CaSO₄ · 2H₂O
H	ⓘ Allanite Group	(A1²⁺REE³⁺)(M1³⁺M2³⁺M3²⁺)O[Si₂O₇][SiO₄](OH)
Li	Lithium
Li	ⓘ Polylithionite	KLi₂Al(Si₄O₁₀)(F,OH)₂
Li	ⓘ Zinnwaldite
Be	Beryllium
Be	ⓘ Bertrandite	Be₄(Si₂O₇)(OH)₂
Be	ⓘ Beryl	Be₃Al₂(Si₆O₁₈)
Be	ⓘ Chrysoberyl	BeAl₂O₄
Be	ⓘ Gadolinite-(Y)	Y₂Fe²⁺Be₂Si₂O₁₀
B	Boron
B	ⓘ Tourmaline	AD₃G₆(T₆O₁₈)(BO₃)₃X₃Z
C	Carbon
C	ⓘ Calcite	CaCO₃
C	ⓘ Malachite	Cu₂(CO₃)(OH)₂
C	ⓘ Parisite	Ca(Ce/La/Nd/REE)₂(CO₃)₃F₂
O	Oxygen
O	ⓘ Quartz var. Agate	SiO₂
O	ⓘ Gypsum var. Alabaster	CaSO₄ · 2H₂O
O	ⓘ Albite	Na(AlSi₃O₈)
O	ⓘ Allanite-(Ce)	(CaCe)(AlAlFe²⁺)O[Si₂O₇][SiO₄](OH)
O	ⓘ Microcline var. Amazonite	K(AlSi₃O₈)
O	ⓘ Quartz var. Amethyst	SiO₂
O	ⓘ Baryte	BaSO₄
O	ⓘ Bertrandite	Be₄(Si₂O₇)(OH)₂
O	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
O	ⓘ Beryl	Be₃Al₂(Si₆O₁₈)
O	ⓘ Calcite	CaCO₃
O	ⓘ Carnotite	K₂(UO₂)₂(VO₄)₂ · 3H₂O
O	ⓘ Cassiterite	SnO₂
O	ⓘ Quartz var. Chalcedony	SiO₂
O	ⓘ Chrysoberyl	BeAl₂O₄
O	ⓘ Chrysocolla	Cu_2-xAl_x(H_2-xSi₂O₅)(OH)₄ · nH₂O, x < 1
O	ⓘ Quartz var. Citrine	SiO₂
O	ⓘ Conichalcite	CaCu(AsO₄)(OH)
O	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
O	ⓘ Euxenite-(Y)	(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)₂O₆
O	ⓘ Fayalite	Fe₂²⁺(SiO₄)
O	ⓘ Fergusonite-(Y)	YNbO₄
O	ⓘ Gadolinite-(Y)	Y₂Fe²⁺Be₂Si₂O₁₀
O	ⓘ Glauconite	K_0.60-0.85(Fe³⁺,Mg,Al)₂(Si,Al)₄O₁₀](OH)₂
O	ⓘ Gypsum	CaSO₄ · 2H₂O
O	ⓘ Hastingsite	NaCa₂(Fe₄²⁺Fe³⁺)(Si₆Al₂)O₂₂(OH)₂
O	ⓘ Hedenbergite	CaFe²⁺Si₂O₆
O	ⓘ Hematite	Fe₂O₃
O	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
O	ⓘ Hollandite	Ba(Mn₆⁴⁺Mn₂³⁺)O₁₆
O	ⓘ Manganite	Mn³⁺O(OH)
O	ⓘ Malachite	Cu₂(CO₃)(OH)₂
O	ⓘ Hematite var. Martite	Fe₂O₃
O	ⓘ Microcline	K(AlSi₃O₈)
O	ⓘ Monazite Group	REE(PO₄)
O	ⓘ Montmorillonite	(Na,Ca)_0.33(Al,Mg)₂(Si₄O₁₀)(OH)₂ · nH₂O
O	ⓘ Albite var. Oligoclase	(Na,Ca)[Al(Si,Al)Si₂O₈]
O	ⓘ Opal	SiO₂ · nH₂O
O	ⓘ Orthoclase	K(AlSi₃O₈)
O	ⓘ Polylithionite	KLi₂Al(Si₄O₁₀)(F,OH)₂
O	ⓘ Pyrochlore Group	A₂Nb₂(O,OH)₆Z
O	ⓘ Pyrolusite	Mn⁴⁺O₂
O	ⓘ Quartz	SiO₂
O	ⓘ Samarskite-(Y)	YFe³⁺Nb₂O₈
O	ⓘ Sanidine	K(AlSi₃O₈)
O	ⓘ Quartz var. Smoky Quartz	SiO₂
O	ⓘ Tenorite	CuO
O	ⓘ Thorite	Th(SiO₄)
O	ⓘ Topaz	Al₂(SiO₄)(F,OH)₂
O	ⓘ Tourmaline	AD₃G₆(T₆O₁₈)(BO₃)₃X₃Z
O	ⓘ Xenotime-(Y)	Y(PO₄)
O	ⓘ Zinnwaldite
O	ⓘ Zircon	Zr(SiO₄)
O	ⓘ Gypsum var. Selenite	CaSO₄ · 2H₂O
O	ⓘ Parisite	Ca(Ce/La/Nd/REE)₂(CO₃)₃F₂
O	ⓘ Zircon var. Cyrtolite	Zr[(SiO₄),(OH)₄]
O	ⓘ Albite var. Cleavelandite	Na(AlSi₃O₈)
O	ⓘ Gypsum var. Satin Spar Gypsum	CaSO₄ · 2H₂O
O	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
O	ⓘ Quartz var. Carnelian	SiO₂
O	ⓘ Garnet Group	X₃Z₂(SiO₄)₃
O	ⓘ Allanite Group	(A1²⁺REE³⁺)(M1³⁺M2³⁺M3²⁺)O[Si₂O₇][SiO₄](OH)
F	Fluorine
F	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
F	ⓘ Fluorite	CaF₂
F	ⓘ Polylithionite	KLi₂Al(Si₄O₁₀)(F,OH)₂
F	ⓘ Topaz	Al₂(SiO₄)(F,OH)₂
F	ⓘ Fluorite var. Yttrofluorite	(Ca_1-xY_x)F_2+x where 0.05 < x < 0.3
F	ⓘ Zinnwaldite
F	ⓘ Fluorite var. Yttrocerite	(Ca,Y,Ce)F_2+x
F	ⓘ Parisite	Ca(Ce/La/Nd/REE)₂(CO₃)₃F₂
Na	Sodium
Na	ⓘ Albite	Na(AlSi₃O₈)
Na	ⓘ Hastingsite	NaCa₂(Fe₄²⁺Fe³⁺)(Si₆Al₂)O₂₂(OH)₂
Na	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
Na	ⓘ Montmorillonite	(Na,Ca)_0.33(Al,Mg)₂(Si₄O₁₀)(OH)₂ · nH₂O
Na	ⓘ Albite var. Oligoclase	(Na,Ca)[Al(Si,Al)Si₂O₈]
Na	ⓘ Albite var. Cleavelandite	Na(AlSi₃O₈)
Na	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
Mg	Magnesium
Mg	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Mg	ⓘ Glauconite	K_0.60-0.85(Fe³⁺,Mg,Al)₂(Si,Al)₄O₁₀](OH)₂
Mg	ⓘ Montmorillonite	(Na,Ca)_0.33(Al,Mg)₂(Si₄O₁₀)(OH)₂ · nH₂O
Al	Aluminium
Al	ⓘ Albite	Na(AlSi₃O₈)
Al	ⓘ Allanite-(Ce)	(CaCe)(AlAlFe²⁺)O[Si₂O₇][SiO₄](OH)
Al	ⓘ Microcline var. Amazonite	K(AlSi₃O₈)
Al	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Al	ⓘ Beryl	Be₃Al₂(Si₆O₁₈)
Al	ⓘ Chrysoberyl	BeAl₂O₄
Al	ⓘ Chrysocolla	Cu_2-xAl_x(H_2-xSi₂O₅)(OH)₄ · nH₂O, x < 1
Al	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
Al	ⓘ Glauconite	K_0.60-0.85(Fe³⁺,Mg,Al)₂(Si,Al)₄O₁₀](OH)₂
Al	ⓘ Hastingsite	NaCa₂(Fe₄²⁺Fe³⁺)(Si₆Al₂)O₂₂(OH)₂
Al	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
Al	ⓘ Microcline	K(AlSi₃O₈)
Al	ⓘ Montmorillonite	(Na,Ca)_0.33(Al,Mg)₂(Si₄O₁₀)(OH)₂ · nH₂O
Al	ⓘ Albite var. Oligoclase	(Na,Ca)[Al(Si,Al)Si₂O₈]
Al	ⓘ Orthoclase	K(AlSi₃O₈)
Al	ⓘ Polylithionite	KLi₂Al(Si₄O₁₀)(F,OH)₂
Al	ⓘ Sanidine	K(AlSi₃O₈)
Al	ⓘ Topaz	Al₂(SiO₄)(F,OH)₂
Al	ⓘ Zinnwaldite
Al	ⓘ Albite var. Cleavelandite	Na(AlSi₃O₈)
Al	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
Si	Silicon
Si	ⓘ Quartz var. Agate	SiO₂
Si	ⓘ Albite	Na(AlSi₃O₈)
Si	ⓘ Allanite-(Ce)	(CaCe)(AlAlFe²⁺)O[Si₂O₇][SiO₄](OH)
Si	ⓘ Microcline var. Amazonite	K(AlSi₃O₈)
Si	ⓘ Quartz var. Amethyst	SiO₂
Si	ⓘ Bertrandite	Be₄(Si₂O₇)(OH)₂
Si	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Si	ⓘ Beryl	Be₃Al₂(Si₆O₁₈)
Si	ⓘ Quartz var. Chalcedony	SiO₂
Si	ⓘ Chrysocolla	Cu_2-xAl_x(H_2-xSi₂O₅)(OH)₄ · nH₂O, x < 1
Si	ⓘ Quartz var. Citrine	SiO₂
Si	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
Si	ⓘ Fayalite	Fe₂²⁺(SiO₄)
Si	ⓘ Gadolinite-(Y)	Y₂Fe²⁺Be₂Si₂O₁₀
Si	ⓘ Glauconite	K_0.60-0.85(Fe³⁺,Mg,Al)₂(Si,Al)₄O₁₀](OH)₂
Si	ⓘ Hastingsite	NaCa₂(Fe₄²⁺Fe³⁺)(Si₆Al₂)O₂₂(OH)₂
Si	ⓘ Hedenbergite	CaFe²⁺Si₂O₆
Si	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
Si	ⓘ Microcline	K(AlSi₃O₈)
Si	ⓘ Montmorillonite	(Na,Ca)_0.33(Al,Mg)₂(Si₄O₁₀)(OH)₂ · nH₂O
Si	ⓘ Albite var. Oligoclase	(Na,Ca)[Al(Si,Al)Si₂O₈]
Si	ⓘ Opal	SiO₂ · nH₂O
Si	ⓘ Orthoclase	K(AlSi₃O₈)
Si	ⓘ Polylithionite	KLi₂Al(Si₄O₁₀)(F,OH)₂
Si	ⓘ Quartz	SiO₂
Si	ⓘ Sanidine	K(AlSi₃O₈)
Si	ⓘ Quartz var. Smoky Quartz	SiO₂
Si	ⓘ Thorite	Th(SiO₄)
Si	ⓘ Topaz	Al₂(SiO₄)(F,OH)₂
Si	ⓘ Zinnwaldite
Si	ⓘ Zircon	Zr(SiO₄)
Si	ⓘ Zircon var. Cyrtolite	Zr[(SiO₄),(OH)₄]
Si	ⓘ Albite var. Cleavelandite	Na(AlSi₃O₈)
Si	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
Si	ⓘ Quartz var. Carnelian	SiO₂
Si	ⓘ Garnet Group	X₃Z₂(SiO₄)₃
Si	ⓘ Allanite Group	(A1²⁺REE³⁺)(M1³⁺M2³⁺M3²⁺)O[Si₂O₇][SiO₄](OH)
P	Phosphorus
P	ⓘ Monazite Group	REE(PO₄)
P	ⓘ Xenotime-(Y)	Y(PO₄)
S	Sulfur
S	ⓘ Gypsum var. Alabaster	CaSO₄ · 2H₂O
S	ⓘ Baryte	BaSO₄
S	ⓘ Chalcopyrite	CuFeS₂
S	ⓘ Gypsum	CaSO₄ · 2H₂O
S	ⓘ Molybdenite	MoS₂
S	ⓘ Pyrite	FeS₂
S	ⓘ Gypsum var. Selenite	CaSO₄ · 2H₂O
S	ⓘ Gypsum var. Satin Spar Gypsum	CaSO₄ · 2H₂O
K	Potassium
K	ⓘ Microcline var. Amazonite	K(AlSi₃O₈)
K	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
K	ⓘ Carnotite	K₂(UO₂)₂(VO₄)₂ · 3H₂O
K	ⓘ Glauconite	K_0.60-0.85(Fe³⁺,Mg,Al)₂(Si,Al)₄O₁₀](OH)₂
K	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
K	ⓘ Microcline	K(AlSi₃O₈)
K	ⓘ Orthoclase	K(AlSi₃O₈)
K	ⓘ Polylithionite	KLi₂Al(Si₄O₁₀)(F,OH)₂
K	ⓘ Sanidine	K(AlSi₃O₈)
K	ⓘ Zinnwaldite
Ca	Calcium
Ca	ⓘ Gypsum var. Alabaster	CaSO₄ · 2H₂O
Ca	ⓘ Allanite-(Ce)	(CaCe)(AlAlFe²⁺)O[Si₂O₇][SiO₄](OH)
Ca	ⓘ Calcite	CaCO₃
Ca	ⓘ Conichalcite	CaCu(AsO₄)(OH)
Ca	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
Ca	ⓘ Euxenite-(Y)	(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)₂O₆
Ca	ⓘ Fluorite	CaF₂
Ca	ⓘ Gypsum	CaSO₄ · 2H₂O
Ca	ⓘ Hastingsite	NaCa₂(Fe₄²⁺Fe³⁺)(Si₆Al₂)O₂₂(OH)₂
Ca	ⓘ Hedenbergite	CaFe²⁺Si₂O₆
Ca	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
Ca	ⓘ Montmorillonite	(Na,Ca)_0.33(Al,Mg)₂(Si₄O₁₀)(OH)₂ · nH₂O
Ca	ⓘ Albite var. Oligoclase	(Na,Ca)[Al(Si,Al)Si₂O₈]
Ca	ⓘ Fluorite var. Yttrofluorite	(Ca_1-xY_x)F_2+x where 0.05 < x < 0.3
Ca	ⓘ Gypsum var. Selenite	CaSO₄ · 2H₂O
Ca	ⓘ Fluorite var. Yttrocerite	(Ca,Y,Ce)F_2+x
Ca	ⓘ Parisite	Ca(Ce/La/Nd/REE)₂(CO₃)₃F₂
Ca	ⓘ Gypsum var. Satin Spar Gypsum	CaSO₄ · 2H₂O
Ca	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
Ti	Titanium
Ti	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Ti	ⓘ Euxenite-(Y)	(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)₂O₆
V	Vanadium
V	ⓘ Carnotite	K₂(UO₂)₂(VO₄)₂ · 3H₂O
Mn	Manganese
Mn	ⓘ Hollandite	Ba(Mn₆⁴⁺Mn₂³⁺)O₁₆
Mn	ⓘ Manganite	Mn³⁺O(OH)
Mn	ⓘ Pyrolusite	Mn⁴⁺O₂
Fe	Iron
Fe	ⓘ Allanite-(Ce)	(CaCe)(AlAlFe²⁺)O[Si₂O₇][SiO₄](OH)
Fe	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Fe	ⓘ Chalcopyrite	CuFeS₂
Fe	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
Fe	ⓘ Fayalite	Fe₂²⁺(SiO₄)
Fe	ⓘ Gadolinite-(Y)	Y₂Fe²⁺Be₂Si₂O₁₀
Fe	ⓘ Glauconite	K_0.60-0.85(Fe³⁺,Mg,Al)₂(Si,Al)₄O₁₀](OH)₂
Fe	ⓘ Hastingsite	NaCa₂(Fe₄²⁺Fe³⁺)(Si₆Al₂)O₂₂(OH)₂
Fe	ⓘ Hedenbergite	CaFe²⁺Si₂O₆
Fe	ⓘ Hematite	Fe₂O₃
Fe	ⓘ Hematite var. Martite	Fe₂O₃
Fe	ⓘ Pyrite	FeS₂
Fe	ⓘ Samarskite-(Y)	YFe³⁺Nb₂O₈
Fe	ⓘ Zinnwaldite
Cu	Copper
Cu	ⓘ Chalcopyrite	CuFeS₂
Cu	ⓘ Chrysocolla	Cu_2-xAl_x(H_2-xSi₂O₅)(OH)₄ · nH₂O, x < 1
Cu	ⓘ Conichalcite	CaCu(AsO₄)(OH)
Cu	ⓘ Malachite	Cu₂(CO₃)(OH)₂
Cu	ⓘ Tenorite	CuO
As	Arsenic
As	ⓘ Conichalcite	CaCu(AsO₄)(OH)
Y	Yttrium
Y	ⓘ Euxenite-(Y)	(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)₂O₆
Y	ⓘ Fergusonite-(Y)	YNbO₄
Y	ⓘ Gadolinite-(Y)	Y₂Fe²⁺Be₂Si₂O₁₀
Y	ⓘ Samarskite-(Y)	YFe³⁺Nb₂O₈
Y	ⓘ Xenotime-(Y)	Y(PO₄)
Y	ⓘ Fluorite var. Yttrofluorite	(Ca_1-xY_x)F_2+x where 0.05 < x < 0.3
Y	ⓘ Fluorite var. Yttrocerite	(Ca,Y,Ce)F_2+x
Zr	Zirconium
Zr	ⓘ Zircon	Zr(SiO₄)
Zr	ⓘ Zircon var. Cyrtolite	Zr[(SiO₄),(OH)₄]
Nb	Niobium
Nb	ⓘ Euxenite-(Y)	(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)₂O₆
Nb	ⓘ Fergusonite-(Y)	YNbO₄
Nb	ⓘ Pyrochlore Group	A₂Nb₂(O,OH)₆Z
Nb	ⓘ Samarskite-(Y)	YFe³⁺Nb₂O₈
Mo	Molybdenum
Mo	ⓘ Molybdenite	MoS₂
Ag	Silver
Ag	ⓘ Native Silver	Ag
Sn	Tin
Sn	ⓘ Cassiterite	SnO₂
Ba	Barium
Ba	ⓘ Baryte	BaSO₄
Ba	ⓘ Hollandite	Ba(Mn₆⁴⁺Mn₂³⁺)O₁₆
La	Lanthanum
La	ⓘ Parisite	Ca(Ce/La/Nd/REE)₂(CO₃)₃F₂
Ce	Cerium
Ce	ⓘ Allanite-(Ce)	(CaCe)(AlAlFe²⁺)O[Si₂O₇][SiO₄](OH)
Ce	ⓘ Euxenite-(Y)	(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)₂O₆
Ce	ⓘ Fluorite var. Yttrocerite	(Ca,Y,Ce)F_2+x
Ce	ⓘ Parisite	Ca(Ce/La/Nd/REE)₂(CO₃)₃F₂
Nd	Neodymium
Nd	ⓘ Parisite	Ca(Ce/La/Nd/REE)₂(CO₃)₃F₂
Ta	Tantalum
Ta	ⓘ Euxenite-(Y)	(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)₂O₆
Au	Gold
Au	ⓘ Native Gold	Au
Th	Thorium
Th	ⓘ Euxenite-(Y)	(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)₂O₆
Th	ⓘ Thorite	Th(SiO₄)
U	Uranium
U	ⓘ Carnotite	K₂(UO₂)₂(VO₄)₂ · 3H₂O
U	ⓘ Euxenite-(Y)	(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)₂O₆

Fossils

There are 185 fossil localities from the PaleoBioDB database within this region.

These data are provided on an experimental basis and are taken from external databases. Mindat.org has no control currently over the accuracy of these data.

Occurrences

185

Youngest Fossil Listed

61.7 Ma (Paleocene)

Oldest Fossil Listed

485 Ma (Cambrian)

Stratigraphic Units

Click here to view 7 stratigraphic units.

Fossils from Region

Click here to show the list.

Accepted Name	Hierarchy	Age
Cryptodira suborder	Animalia : Chordata : Reptilia : Testudines : Cryptodira	72.1 - 63.3 Ma Phanerozoic
Baenidae family	Animalia : Chordata : Reptilia : Testudines : Baenidae	66 - 63.3 Ma Paleocene
Adocus genus	Animalia : Chordata : Reptilia : Testudines : Adocidae : *Adocus*	100.5 - 63.3 Ma Phanerozoic
Trionychidae family	Animalia : Chordata : Reptilia : Testudines : Trionychidae	72.1 - 63.3 Ma Phanerozoic
Mesodma genus	Animalia : Chordata : Mammalia : Ptilodontidae : *Mesodma*	66 - 63.3 Ma Paleocene
Oxyprimus genus	Animalia : Chordata : Mammalia : Arctocyonidae : *Oxyprimus*	66 - 63.3 Ma Paleocene
Maiorana genus	Animalia : Chordata : Mammalia : Periptychidae : *Maiorana*	66 - 63.3 Ma Paleocene
Cimexomys minor species	Animalia : Chordata : Mammalia : Taeniolabidae : Cimexomys : *Cimexomys minor*	66 - 63.3 Ma Paleocene
Baioconodon nordicus species	Animalia : Chordata : Mammalia : Arctocyonidae : Baioconodon : *Baioconodon nordicus*	66 - 63.3 Ma Paleocene
Mesodma ambigua species	Animalia : Chordata : Mammalia : Ptilodontidae : Mesodma : *Mesodma ambigua*	66 - 63.3 Ma Paleocene
Mesodma hensleighi species	Animalia : Chordata : Mammalia : Ptilodontidae : Mesodma : *Mesodma hensleighi*	66 - 63.3 Ma Paleocene
Periptychus coarctatus species	Animalia : Chordata : Mammalia : Periptychidae : Periptychus : *Periptychus coarctatus*	66 - 63.3 Ma Paleocene
Protungulatum donnae species	Animalia : Chordata : Mammalia : Scandentia : Tupaiidae : Protungulatum : *Protungulatum donnae*	66 - 63.3 Ma Paleocene
Sterculiaceae family	Plantae : Spermatophyta : Magnoliopsida : Malvales : Sterculiaceae	66 - 61.7 Ma Paleocene
Artocarpus lessigiana species	Plantae : Tracheophyta : Magnoliopsida : Rosales : Moraceae : Artocarpus : *Artocarpus lessigiana*	66 - 61.7 Ma Paleocene
Magnoliopsida class	Plantae : Tracheophyta : Magnoliopsida	66 - 61.7 Ma Paleocene
Tiliaceae family	Plantae : Tracheophyta : Magnoliopsida : Malvales : Tiliaceae	66 - 61.7 Ma Paleocene
Urticaceae family	Plantae : Tracheophyta : Magnoliopsida : Rosales : Urticaceae	66 - 61.7 Ma Paleocene
Trionychinae unranked clade	Animalia : Chordata : Reptilia : Testudines : Trionychidae : Trionychinae	70.6 - 66 Ma Late/Upper Cretaceous
Compsemys victa species	Animalia : Chordata : Reptilia : Testudines : Compsemydidae : Compsemys : *Compsemys victa*	70.6 - 63.3 Ma Phanerozoic
Plesiobaena antiqua species	Animalia : Chordata : Reptilia : Testudines : Baenidae : Plesiobaena : *Plesiobaena antiqua*	66 - 63.3 Ma Paleocene
Aspideretoides genus	Animalia : Chordata : Reptilia : Testudines : Trionychidae : *Aspideretoides*	72.1 - 66 Ma Late/Upper Cretaceous
Neoplagiaulacidae family	Animalia : Chordata : Mammalia : Neoplagiaulacidae	66 - 63.3 Ma Paleocene
Helopanoplia distincta species	Animalia : Chordata : Reptilia : Testudines : Trionychidae : Helopanoplia : *Helopanoplia distincta*	72.1 - 66 Ma Late/Upper Cretaceous
Hadrosauropodus leonardii species	Animalia : Chordata : Ornithischia : Iguanodontipodidae : Hadrosauropodus : *Hadrosauropodus leonardii*	113 - 100.5 Ma Early/Lower Cretaceous
Magnoavipes caneeri species	Animalia : Chordata : Saurischia : Avetheropoda : Ornithomimipodidae : Magnoavipes : *Magnoavipes caneeri*	113 - 100.5 Ma Early/Lower Cretaceous
Trionyx singularis species	Animalia : Chordata : Reptilia : Testudines : Trionychidae : Trionyx : *Trionyx singularis*	66 - 63.3 Ma Paleocene
Plastomenidae family	Animalia : Chordata : Reptilia : Testudines : Plastomenidae	66 - 63.3 Ma Paleocene
Denverus middletoni species	Animalia : Chordata : Reptilia : Testudines : Chelydridae : Denverus : *Denverus middletoni*	66 - 63.3 Ma Paleocene
Ampliconus browni species	Animalia : Chordata : Mammalia : Periptychidae : Ampliconus : *Ampliconus browni*	66 - 63.3 Ma Paleocene
Exiteloceras jenneyi species	Animalia : Mollusca : Cephalopoda : Ammonitida : Nostoceratidae : Exiteloceras : *Exiteloceras jenneyi*	83.5 - 70.6 Ma Late/Upper Cretaceous
Solenoceras larimerense species	Animalia : Mollusca : Cephalopoda : Ammonoidea : Diplomoceratidae : Solenoceras : *Solenoceras larimerense*	83.5 - 70.6 Ma Late/Upper Cretaceous
Sassafras genus	Plantae : Tracheophyta : Magnoliopsida : Laurales : Lauraceae : *Sassafras*	66 - 61.7 Ma Paleocene
Fabaceae family	Plantae : Tracheophyta : Magnoliopsida : Fabales : Fabaceae	66 - 61.7 Ma Paleocene
Thylacodon montanensis species	Animalia : Chordata : Mammalia : Marsupialia : Thylacodon : *Thylacodon montanensis*	66 - 63.3 Ma Paleocene
Eubaenina subtribe	Animalia : Chordata : Reptilia : Testudines : Baenidae : Eubaenina	72.1 - 66 Ma Late/Upper Cretaceous
Zizyphus genus	Plantae : Tracheophyta : Magnoliopsida : Rosales : Rhamnaceae : *Zizyphus*	66 - 61.7 Ma Paleocene
Platanites marginata species	Plantae : Tracheophyta : Magnoliopsida : Proteales : Platanaceae : Platanites : *Platanites marginata*	66 - 61.7 Ma Paleocene
Rossodus manitouensis species	Animalia : Chordata : Conodonta : Oistodontidae : Rossodus : *Rossodus manitouensis*	485.4 - 477.7 Ma Paleozoic
Variabiloconus transiapeticus species	Animalia : Chordata : Conodonta : Protopanderodontida : Oneotodontidae : Variabiloconus : *Variabiloconus transiapeticus*	485.4 - 477.7 Ma Paleozoic

Fossil Localities

Click to show 6 fossil localities

USA

Colorado
- Douglas County

Other Databases

Wikipedia:	https://en.wikipedia.org/wiki/Douglas_County,_Colorado
Wikidata ID:	Q115556
GeoNames ID:	5419891

Localities in this Region

USA

Colorado
- Douglas County

USA

Colorado
- Douglas County

Other Regions, Features and Areas that Intersect

North AmericaContinent

Rocky MountainsMountain Range

North America PlateTectonic Plate

Denver BasinBasin
Great Plains DomainDomain
Southern Rocky MountainsOrogenic Belt
Yavapai TerraneVolcanic Arc

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.

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