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Longfellow Mine, Red Mountain District, San Juan Co., Colorado, USAi
Regional Level Types
Longfellow MineMine
Red Mountain DistrictMining District
San Juan Co.County
ColoradoState
USACountry

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Latitude & Longitude (WGS84): 37° 53' 48'' North , 107° 42' 37'' West
Latitude & Longitude (decimal): 37.89667,-107.71028
GeoHash:G#: 9wersfzu0
Locality type:Mine
Köppen climate type:Dfc : Subarctic climate
Nearest Settlements:
PlacePopulationDistance
Telluride2,399 (2018)10.0km
Silverton637 (2011)10.2km
Ophir169 (2017)11.6km
Mountain Village1,395 (2017)13.4km
Ouray1,008 (2017)14.4km


Ref.: Rocks & Min.: 64:502.

Regions containing this locality

North America PlateTectonic Plate
Rocky Mountains, North AmericaMountain Range

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


22 valid minerals.

Detailed Mineral List:

Aurichalcite ?
Formula: (Zn,Cu)5(CO3)2(OH)6
Reference: Minerals of Colorado (1997) E.B. Eckel
Baryte
Formula: BaSO4
Reference: Collected by Bill Dameron 2011; location definitely places origin as Longfellow mine; USGS Prof. Paper 750C
Calcite
Formula: CaCO3
Reference: Rob Lavinsky photo
Chalcopyrite
Formula: CuFeS2
Reference: USGS Prof. Paper 750C
'Chlorite Group'
Reference: Min Rec (1986) 17:229-236; USGS Prof. Paper 750C
Dickite
Formula: Al2(Si2O5)(OH)4
Description: Luedke and Hosterman (1971) say: The dickite is white or light grey, massive appearing, and moderately soft. It occurs principally as small pore and cavity fillings and locally encrusting about ore minerals. As seen in thin section, the dickite occurs as single and clustered irregular pseudohexagonal crystals with low birefringence.
Reference: Min Rec (1986) 17:229-236; USGS Prof. Paper 750C
Enargite
Formula: Cu3AsS4
Reference: Minerals of Colorado (1997) Eckel, E. B.; USGS Prof. Paper 750C; 2008 New Mexico Mineral Symposium abstracts
Fluorapatite
Formula: Ca5(PO4)3F
Reference: Minerals of Colorado (1997) Eckel, E. B.
Fluorite
Formula: CaF2
Reference: Minerals of Colorado (1997) Eckel, E. B.; USGS Prof. Paper 750C
Galena
Formula: PbS
Reference: USGS Prof. Paper 750C
'Illite-1Md'
Reference: Minerals of Colorado (1997) Eckel, E. B.; USGS Prof. Paper 750C
'Illite-2M'
Reference: Minerals of Colorado (1997) Eckel, E. B.; USGS Prof. Paper 750C
Kaolinite
Formula: Al2(Si2O5)(OH)4
Reference: Minerals of Colorado (1997) Eckel, E. B.
Montmorillonite
Formula: (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Reference: Min Rec (1986) 17:229-236; USGS Prof. Paper 750C
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Min Rec (1986) 17:229-236; USGS Prof. Paper 750C
Muscovite var: Illite
Formula: K0.65Al2.0[Al0.65Si3.35O10](OH)2
Reference: Min Rec (1986) 17:229-236; USGS Prof. Paper 750C
Muscovite var: Sericite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Minerals of Colorado (1997) E.B. Eckel
Pyrite
Formula: FeS2
Reference: Minerals of Colorado (1997) E.B. Eckel; USGS Prof. Paper 750C
Pyrophyllite
Formula: Al2Si4O10(OH)2
Reference: Min Rec (1986) 17:229-236; USGS Prof. Paper 750C
Quartz
Formula: SiO2
Reference: Minerals of Colorado (1997) E.B. Eckel; USGS Prof. Paper 750C; 2008 New Mexico Mineral Symposium abstracts
Rectorite
Formula: (Na,Ca)Al4((Si,Al)8O20)(OH)4 · 2H2O
Reference: Minerals of Colorado (1997) E.B. Eckel
Scorodite
Formula: Fe3+AsO4 · 2H2O
Reference: Minerals of Colorado (1997) E.B. Eckel
Sphalerite
Formula: ZnS
Reference: Minerals of Colorado (1997) E.B. Eckel; USGS Prof. Paper 750C
Tennantite
Formula: Cu6[Cu4(Fe,Zn)2]As4S13
Reference: Minerals of Colorado (1997) Eckel, E. B.
Tetrahedrite
Formula: Cu6[Cu4(Fe,Zn)2]Sb4S13
Reference: Minerals of Colorado (1997) Eckel, E. B.
Wurtzite
Formula: (Zn,Fe)S
Reference: Rocks & Min.: 64:502.
Zunyite
Formula: Al13Si5O20(OH,F)18Cl
Reference: USGS Prof. Paper 750C

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Chalcopyrite2.CB.10aCuFeS2
Enargite2.KA.05Cu3AsS4
Galena2.CD.10PbS
Pyrite2.EB.05aFeS2
Sphalerite2.CB.05aZnS
Tennantite2.GB.05Cu6[Cu4(Fe,Zn)2]As4S13
Tetrahedrite2.GB.05Cu6[Cu4(Fe,Zn)2]Sb4S13
Wurtzite2.CB.45(Zn,Fe)S
Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Aurichalcite ?5.BA.15(Zn,Cu)5(CO3)2(OH)6
Calcite5.AB.05CaCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Baryte7.AD.35BaSO4
Group 8 - Phosphates, Arsenates and Vanadates
Fluorapatite8.BN.05Ca5(PO4)3F
Scorodite8.CD.10Fe3+AsO4 · 2H2O
Group 9 - Silicates
Dickite9.ED.05Al2(Si2O5)(OH)4
Kaolinite9.ED.05Al2(Si2O5)(OH)4
Montmorillonite9.EC.40(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var: Illite9.EC.15K0.65Al2.0[Al0.65Si3.35O10](OH)2
var: Sericite9.EC.15KAl2(AlSi3O10)(OH)2
Pyrophyllite9.EC.10Al2Si4O10(OH)2
Rectorite9.EC.60(Na,Ca)Al4((Si,Al)8O20)(OH)4 · 2H2O
Zunyite9.BJ.55Al13Si5O20(OH,F)18Cl
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-
'Illite-1Md'-
'Illite-2M'-

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
Sphalerite2.8.2.1ZnS
Wurtzite2.8.7.1(Zn,Fe)S
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 3 - SULFOSALTS
ø = 4
Enargite3.2.1.1Cu3AsS4
3 <ø < 4
Tennantite3.3.6.2Cu6[Cu4(Fe,Zn)2]As4S13
Tetrahedrite3.3.6.1Cu6[Cu4(Fe,Zn)2]Sb4S13
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Aurichalcite ?16a.4.2.1(Zn,Cu)5(CO3)2(OH)6
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Baryte28.3.1.1BaSO4
Group 40 - HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
(AB)5(XO4)2·xH2O
Scorodite40.4.1.3Fe3+AsO4 · 2H2O
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
A5(XO4)3Zq
Fluorapatite41.8.1.1Ca5(PO4)3F
Group 57 - SOROSILICATES Si3O10 Groups and Larger Noncyclic Groups
Insular Si3O10 and Larger Noncyclic Groups with [Si5O16] groups
Zunyite57.3.1.1Al13Si5O20(OH,F)18Cl
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 1:1 layers
Dickite71.1.1.1Al2(Si2O5)(OH)4
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
var: Illite71.2.2d.2K0.65Al2.0[Al0.65Si3.35O10](OH)2
Pyrophyllite71.2.1.1Al2Si4O10(OH)2
Sheets of 6-membered rings with 2:1 clays
Montmorillonite71.3.1a.2(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Sheets of 6-membered rings interlayered 1:1, 2:1, and octahedra
Rectorite71.4.2.7(Na,Ca)Al4((Si,Al)8O20)(OH)4 · 2H2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
'Chlorite Group'-
'Illite-1Md'-
'Illite-2M'-
Kaolinite-Al2(Si2O5)(OH)4
Muscovite
var: Sericite
-KAl2(AlSi3O10)(OH)2

List of minerals for each chemical element

HHydrogen
H DickiteAl2(Si2O5)(OH)4
H Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
H PyrophylliteAl2Si4O10(OH)2
H Muscovite (var: Illite)K0.65Al2.0[Al0.65Si3.35O10](OH)2
H KaoliniteAl2(Si2O5)(OH)4
H Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
H Rectorite(Na,Ca)Al4((Si,Al)8O20)(OH)4 · 2H2O
H ScoroditeFe3+AsO4 · 2H2O
H ZunyiteAl13Si5O20(OH,F)18Cl
H MuscoviteKAl2(AlSi3O10)(OH)2
H Aurichalcite(Zn,Cu)5(CO3)2(OH)6
CCarbon
C CalciteCaCO3
C Aurichalcite(Zn,Cu)5(CO3)2(OH)6
OOxygen
O FluorapatiteCa5(PO4)3F
O DickiteAl2(Si2O5)(OH)4
O Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
O PyrophylliteAl2Si4O10(OH)2
O Muscovite (var: Illite)K0.65Al2.0[Al0.65Si3.35O10](OH)2
O KaoliniteAl2(Si2O5)(OH)4
O Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
O Rectorite(Na,Ca)Al4((Si,Al)8O20)(OH)4 · 2H2O
O ScoroditeFe3+AsO4 · 2H2O
O QuartzSiO2
O CalciteCaCO3
O BaryteBaSO4
O ZunyiteAl13Si5O20(OH,F)18Cl
O MuscoviteKAl2(AlSi3O10)(OH)2
O Aurichalcite(Zn,Cu)5(CO3)2(OH)6
FFluorine
F FluorapatiteCa5(PO4)3F
F FluoriteCaF2
F ZunyiteAl13Si5O20(OH,F)18Cl
NaSodium
Na Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Na Rectorite(Na,Ca)Al4((Si,Al)8O20)(OH)4 · 2H2O
MgMagnesium
Mg Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
AlAluminium
Al DickiteAl2(Si2O5)(OH)4
Al Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Al PyrophylliteAl2Si4O10(OH)2
Al Muscovite (var: Illite)K0.65Al2.0[Al0.65Si3.35O10](OH)2
Al KaoliniteAl2(Si2O5)(OH)4
Al Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Al Rectorite(Na,Ca)Al4((Si,Al)8O20)(OH)4 · 2H2O
Al ZunyiteAl13Si5O20(OH,F)18Cl
Al MuscoviteKAl2(AlSi3O10)(OH)2
SiSilicon
Si DickiteAl2(Si2O5)(OH)4
Si Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Si PyrophylliteAl2Si4O10(OH)2
Si Muscovite (var: Illite)K0.65Al2.0[Al0.65Si3.35O10](OH)2
Si KaoliniteAl2(Si2O5)(OH)4
Si Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Si Rectorite(Na,Ca)Al4((Si,Al)8O20)(OH)4 · 2H2O
Si QuartzSiO2
Si ZunyiteAl13Si5O20(OH,F)18Cl
Si MuscoviteKAl2(AlSi3O10)(OH)2
PPhosphorus
P FluorapatiteCa5(PO4)3F
SSulfur
S Wurtzite(Zn,Fe)S
S EnargiteCu3AsS4
S TennantiteCu6[Cu4(Fe,Zn)2]As4S13
S TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
S SphaleriteZnS
S PyriteFeS2
S BaryteBaSO4
S ChalcopyriteCuFeS2
S GalenaPbS
ClChlorine
Cl ZunyiteAl13Si5O20(OH,F)18Cl
KPotassium
K Muscovite (var: Illite)K0.65Al2.0[Al0.65Si3.35O10](OH)2
K Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
K MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Ca FluorapatiteCa5(PO4)3F
Ca Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Ca FluoriteCaF2
Ca Rectorite(Na,Ca)Al4((Si,Al)8O20)(OH)4 · 2H2O
Ca CalciteCaCO3
FeIron
Fe TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
Fe ScoroditeFe3+AsO4 · 2H2O
Fe PyriteFeS2
Fe ChalcopyriteCuFeS2
CuCopper
Cu EnargiteCu3AsS4
Cu TennantiteCu6[Cu4(Fe,Zn)2]As4S13
Cu TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
Cu ChalcopyriteCuFeS2
Cu Aurichalcite(Zn,Cu)5(CO3)2(OH)6
ZnZinc
Zn Wurtzite(Zn,Fe)S
Zn TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
Zn SphaleriteZnS
Zn Aurichalcite(Zn,Cu)5(CO3)2(OH)6
AsArsenic
As EnargiteCu3AsS4
As TennantiteCu6[Cu4(Fe,Zn)2]As4S13
As ScoroditeFe3+AsO4 · 2H2O
SbAntimony
Sb TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
BaBarium
Ba BaryteBaSO4
PbLead
Pb GalenaPbS

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Miocene - Eocene
5.333 - 56 Ma



ID: 3190650
Cenozoic volcanic rocks

Age: Cenozoic (5.333 - 56 Ma)

Stratigraphic Name: San Juan Mountains

Comments: Southern Rocky Mountains

Lithology: Intermediate-felsic volcanic rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Miocene - Eocene
5.333 - 56 Ma



ID: 2989124
Middle Tertiary intrusive rocks

Age: Cenozoic (5.333 - 56 Ma)

Description: Intermediate to felsic compositions

Comments: Original map source: Green, G.N., 1992, The Digital Geologic Map of Colorado in ARC/INFO Format: U.S. Geological Survey Open-File Report 92-0507, 9 p., scale 1:500,000.

Lithology: Major:{mafic hypabyssal,felsic hypabyssal}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
New Mexico Mineral Symposium abstracts (2008).
Luedke R.G. and Hosterman J.W. (1971): Clay Minerals, Longfellow Mine, San Juan County, Colo.; U.S.G.S. Professional Paper 750-C; pp. 104-111


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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