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Carolina Mineral Company No. 20 Mine (Old 20 Mine), Crabtree Creek, Spruce Pine District, Yancey Co., North Carolina, USA

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Latitude & Longitude (WGS84): 35° 52' 17'' North , 82° 9' 20'' West
Latitude & Longitude (decimal): 35.87139,-82.15556
GeoHash:G#: dnms4d0ju
Locality type:Mine
Köppen climate type:Cfb : Temperate oceanic climate


Granite pegmatite. A feldspar-mica mine located 5 miles SW of Spruce Pine on the West side of state route 1002 (road to Little Switzerland).

Commodities (Major) - Feldspar, Mica
Development Status: Past Producer
Structure: Pegmatite Is Partly Concordant With The Foliation Of The Enclosing Country Rock
Host Rock: Mica Schist

Granite pegmatite. A feldspar-mica mine located 5 miles SW of Spruce Pine on the West side of state route 1002 (road to Little Switzerland).

Commodities (Major) - Feldspar, Mica
Development Status: Past Producer
Structure: Pegmatite Is Partly Concordant With The Foliation Of The Enclosing Country Rock
Host Rock: Mica Schist

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

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


Mineral List


15 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Albite
Formula: Na(AlSi3O8)
Reference: Erd,Richard C.,(1996) U.S Geological Survey unpublished data
Albite var: Oligoclase
Formula: (Na,Ca)[Al(Si,Al)Si2O8]
Reference: Erd,Richard C.,(1996) U.S Geological Survey unpublished data
'Albite-Anorthite Series'
Reference: Lesure, Frank G.,(1968) Mica Deposits of the Blue Ridge in North Carolina:USGS Professional Paper 577
'Allanite Group'
Formula: {A12+REE3+}{M3+2M32+}(Si2O7)(SiO4)O(OH)
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
'Apatite'
Reference: Rocks and Minerals (1985) 60:84-93,99
Autunite
Formula: Ca(UO2)2(PO4)2 · 11H2O
Reference: Rocks and Minerals (1985) 60:84-93,99
Beryl
Formula: Be3Al2(Si6O18)
Reference: Rocks and Minerals (1985) 60:84-93,99
'Biotite'
Reference: Lesure, Frank G.,(1968) Mica Deposits of the Blue Ridge in North Carolina:USGS Professional Paper 577
Clarkeite
Formula: (Na,Ca,Pb)(UO2)O(OH) · 0-1H2O
Reference: Rocks and Minerals,Sep-Oct,2004
Clinozoisite
Formula: {Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Reference: Richard C. Erd, U.S. Geological Survey
Clinozoisite var: Clinothulite
Formula: {Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Reference: Richard C. Erd, U.S. Geological Survey
'Columbite-(Fe)-Columbite-(Mn) Series'
Habit: Not observed, massive
Colour: black
Fluorescence: none
Description: See further under euxenite-Y. In the 1980's I was on a re-scraped portion of an old unpaved mine road access to this mine, and I found on the road a chunk of pegmatite about six inches across that had splotches and streaks of sub-metallic black columbiteSee further under euxenite-Y. In the 1980's I was on a re-scraped portion of an old unpaved mine road access to this mine, and I found on the road a chunk of pegmatite about six inches across that had splotches and streaks of sub-metallic black columbite
Reference: Specimens in former Green's Mineral Museum and Shop; others.; Specimens in former Green's Mineral Museum and Shop; others.
Euxenite-(Y)
Formula: (Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Habit: Thin steel-color veinlets cutting darker columbite.
Colour: Metallic steel-grey
Fluorescence: None
Description: I witnessed Mr. Green showing me a personal find from this locality he made in the 1950's or 60's. It was a two inch crystalline mass of columbite with straight steel-colored veinlets cutting across it. He said these were confirmed to be euxenite. This
Reference: Specimens in former Green's Mineral Museum and Shop; others.
'commodity:Feldspar'
Reference: From USGS MRDS database
'Feldspar Group'
Reference: Lesure, Frank G.,(1968) Mica Deposits of the Blue Ridge in North Carolina:USGS Professional Paper 577
'Feldspar Group var: Perthite'
Reference: Lesure, Frank G.,(1968) Mica Deposits of the Blue Ridge in North Carolina:USGS Professional Paper 577
'Garnet Group'
Formula: X3Z2(SiO4)3
Reference: Lesure, Frank G.,(1968) Mica Deposits of the Blue Ridge in North Carolina:USGS Professional Paper 577
'Gummite'
Reference: Rocks and Minerals (1985) 60:84-93,99
'K Feldspar'
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
'commodity:Mica'
Reference: From USGS MRDS database
'Mica schist'
Reference: From USGS MRDS database
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Muscovite var: Sericite
Formula: KAl2(AlSi3O10)(OH)2
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Opal
Formula: SiO2 · nH2O
Reference: Rocks and Minerals (1985) 60:84-93,99; U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Opal var: Opal-AN
Formula: SiO2 · nH2O
Reference: Rocks and Minerals (1985) 60:84-93,99; U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Samarskite-(Y)
Formula: (Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
Reference: Lesure, Frank G.,(1968) Mica Deposits of the Blue Ridge in North Carolina:USGS Professional Paper 577
Siderite
Formula: FeCO3
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Torbernite
Formula: Cu(UO2)2(PO4)2 · 12H2O
Reference: Rocks and Minerals (1985) 60:84-93,99
Uraninite
Formula: UO2
Reference: Rocks and Minerals (1985) 60:84-93,99; Smithsonian Institution Mineral Reference Collection No.C5584-00
Uranophane
Formula: Ca(UO2)2(SiO3OH)2 · 5H2O
Reference: Specimens in former Green's Mineral Museum and Shop; others.
Zircon
Formula: Zr(SiO4)
Reference: Rocks and Minerals (1985) 60:84-93,99
Zircon var: Cyrtolite
Formula: Zr[(SiO4),(OH)4]
Reference: Rocks and Minerals (1985) 60:84-93,99
Zoisite
Formula: {Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
'Clarkeite'4.GC.05(Na,Ca,Pb)(UO2)O(OH) · 0-1H2O
Euxenite-(Y)4.DG.05(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Opal4.DA.10SiO2 · nH2O
var: Opal-AN4.DA.10SiO2 · nH2O
'Samarskite-(Y)'4.DB.25(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
Uraninite4.DL.05UO2
Group 5 - Nitrates and Carbonates
Siderite5.AB.05FeCO3
Group 8 - Phosphates, Arsenates and Vanadates
'Autunite'8.EB.05Ca(UO2)2(PO4)2 · 11H2O
Torbernite8.EB.05Cu(UO2)2(PO4)2 · 12H2O
Group 9 - Silicates
'Albite'9.FA.35Na(AlSi3O8)
var: Oligoclase9.FA.35(Na,Ca)[Al(Si,Al)Si2O8]
'Beryl'9.CJ.05Be3Al2(Si6O18)
Clinozoisite9.BG.05a{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
var: Clinothulite9.BG.05a{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var: Sericite9.EC.15KAl2(AlSi3O10)(OH)2
Uranophane9.AK.15Ca(UO2)2(SiO3OH)2 · 5H2O
Zircon9.AD.30Zr(SiO4)
var: Cyrtolite9.AD.30Zr[(SiO4),(OH)4]
Zoisite9.BG.10{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Unclassified Minerals, Rocks, etc.
'Albite-Anorthite Series'-
'Allanite Group'-{A12+REE3+}{M3+2M32+}(Si2O7)(SiO4)O(OH)
'Apatite'-
'Biotite'-
Columbite-(Fe)-Columbite-(Mn) Series-
Feldspar Group-
'var: Perthite'-
Garnet Group-X3Z2(SiO4)3
Gummite-
K Feldspar-
Mica schist-

List of minerals arranged by Dana 8th Edition classification

Group 5 - OXIDES CONTAINING URANIUM OR THORIUM
AXO2·xH2O
Uraninite5.1.1.1UO2
AX2O7·xH2O
Clarkeite5.4.1.1(Na,Ca,Pb)(UO2)O(OH) · 0-1H2O
Group 8 - MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
ABO4
Samarskite-(Y)8.1.11.1(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
AB2O6
Euxenite-(Y)8.3.8.2(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Siderite14.1.1.3FeCO3
Group 40 - HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
AB2(XO4)2·xH2O, containing (UO2)2+
Autunite40.2a.1.1Ca(UO2)2(PO4)2 · 11H2O
Torbernite40.2a.13.1Cu(UO2)2(PO4)2 · 12H2O
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in >[6] coordination
Zircon51.5.2.1Zr(SiO4)
Group 53 - NESOSILICATES Insular SiO4 Groups and Other Anions or Complex Cations
Insular SiO4 Groups and Other Anions of Complex Cations with (UO2)
Uranophane53.3.1.2Ca(UO2)2(SiO3OH)2 · 5H2O
Group 58 - SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
Clinozoisite58.2.1a.4{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Zoisite58.2.1b.1{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
Beryl61.1.1.1Be3Al2(Si6O18)
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with H2O and organics
Opal75.2.1.1SiO2 · nH2O
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite76.1.3.1Na(AlSi3O8)
Unclassified Minerals, Rocks, etc.
var: Oligoclase-(Na,Ca)[Al(Si,Al)Si2O8]
'Albite-Anorthite Series'-
'Allanite Group'-{A12+REE3+}{M3+2M32+}(Si2O7)(SiO4)O(OH)
'Apatite'-
'Biotite'-
Clinozoisite
var: Clinothulite
-{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
'Columbite-(Fe)-Columbite-(Mn) Series'-
'Feldspar Group'-
'var: Perthite'-
'Garnet Group'-X3Z2(SiO4)3
'Gummite'-
'K Feldspar'-
'Mica schist'-
Muscovite
var: Sericite
-KAl2(AlSi3O10)(OH)2
Opal
var: Opal-AN
-SiO2 · nH2O
Zircon
var: Cyrtolite
-Zr[(SiO4),(OH)4]

List of minerals for each chemical element

HHydrogen
H Allanite Group{A12+REE3+}{M23+M32+}(Si2O7)(SiO4)O(OH)
H AutuniteCa(UO2)2(PO4)2 · 11H2O
H Clarkeite(Na,Ca,Pb)(UO2)O(OH) · 0-1H2O
H Clinozoisite (var: Clinothulite){Ca2}{Al3}(Si2O7)(SiO4)O(OH)
H Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
H Zircon (var: Cyrtolite)Zr[(SiO4),(OH)4]
H MuscoviteKAl2(AlSi3O10)(OH)2
H OpalSiO2 · nH2O
H Opal (var: Opal-AN)SiO2 · nH2O
H Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
H TorberniteCu(UO2)2(PO4)2 · 12H2O
H UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
H Zoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
BeBeryllium
Be BerylBe3Al2(Si6O18)
CCarbon
C SideriteFeCO3
OOxygen
O AlbiteNa(AlSi3O8)
O Allanite Group{A12+REE3+}{M23+M32+}(Si2O7)(SiO4)O(OH)
O AutuniteCa(UO2)2(PO4)2 · 11H2O
O BerylBe3Al2(Si6O18)
O Clarkeite(Na,Ca,Pb)(UO2)O(OH) · 0-1H2O
O Clinozoisite (var: Clinothulite){Ca2}{Al3}(Si2O7)(SiO4)O(OH)
O Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
O Zircon (var: Cyrtolite)Zr[(SiO4),(OH)4]
O Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
O Garnet GroupX3Z2(SiO4)3
O MuscoviteKAl2(AlSi3O10)(OH)2
O Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
O OpalSiO2 · nH2O
O Opal (var: Opal-AN)SiO2 · nH2O
O Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
O Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
O SideriteFeCO3
O TorberniteCu(UO2)2(PO4)2 · 12H2O
O UraniniteUO2
O UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
O ZirconZr(SiO4)
O Zoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
NaSodium
Na AlbiteNa(AlSi3O8)
Na Clarkeite(Na,Ca,Pb)(UO2)O(OH) · 0-1H2O
Na Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
AlAluminium
Al AlbiteNa(AlSi3O8)
Al BerylBe3Al2(Si6O18)
Al Clinozoisite (var: Clinothulite){Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Al Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Al Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Al Zoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
SiSilicon
Si AlbiteNa(AlSi3O8)
Si Allanite Group{A12+REE3+}{M23+M32+}(Si2O7)(SiO4)O(OH)
Si BerylBe3Al2(Si6O18)
Si Clinozoisite (var: Clinothulite){Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Si Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Si Zircon (var: Cyrtolite)Zr[(SiO4),(OH)4]
Si Garnet GroupX3Z2(SiO4)3
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Si OpalSiO2 · nH2O
Si Opal (var: Opal-AN)SiO2 · nH2O
Si Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Si UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
Si ZirconZr(SiO4)
Si Zoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
PPhosphorus
P AutuniteCa(UO2)2(PO4)2 · 11H2O
P TorberniteCu(UO2)2(PO4)2 · 12H2O
KPotassium
K MuscoviteKAl2(AlSi3O10)(OH)2
K Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
CaCalcium
Ca AutuniteCa(UO2)2(PO4)2 · 11H2O
Ca Clinozoisite (var: Clinothulite){Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Ca Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Ca Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Ca Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Ca Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
Ca UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
Ca Zoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
TiTitanium
Ti Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
FeIron
Fe Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
Fe SideriteFeCO3
CuCopper
Cu TorberniteCu(UO2)2(PO4)2 · 12H2O
YYttrium
Y Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Y Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
ZrZirconium
Zr Zircon (var: Cyrtolite)Zr[(SiO4),(OH)4]
Zr ZirconZr(SiO4)
NbNiobium
Nb Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Nb Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
CeCerium
Ce Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
TaTantalum
Ta Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Ta Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
ThThorium
Th Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Th Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
UUranium
U AutuniteCa(UO2)2(PO4)2 · 11H2O
U Clarkeite(Na,Ca,Pb)(UO2)O(OH) · 0-1H2O
U Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
U Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
U TorberniteCu(UO2)2(PO4)2 · 12H2O
U UraniniteUO2
U UranophaneCa(UO2)2(SiO3OH)2 · 5H2O

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

Neoproterozoic
541 - 1000 Ma



ID: 2722709
Alligator Back Formation; Gneiss

Age: Neoproterozoic (541 - 1000 Ma)

Stratigraphic Name: Alligator Back Formation

Description: Finely laminated to thin layered; locally contains massive gneiss and micaceous granule conglomerate; includes schist, phyllite, and amphibolite.

Comments: Original map source: The North Carolina Dept. of Environment, Health, and Natural Resources, Division of Land Resources, NC Geological Survey, in cooperation with the NC Center for Geographic Information and Analysis, 1998 (updated 2007), Geology - North Carolina (1:250,000)

Lithology: Major:{gneiss}, Minor:{conglomerate,schist,phyllite,amphibolite}

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]

Neoproterozoic
541 - 1000 Ma



ID: 3186076
Neoproterozoic volcanic rocks

Age: Neoproterozoic (541 - 1000 Ma)

Lithology: 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]

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)
LESURE, F.G. (1968), MICA DEPOSITS OF THE BLUE RIDGE IN NORTH CAROLINA: USGS PROFESSIONAL PAPER 577: 12.
Smithsonian Institution Mineral Reference Collection No.C5584-00 (Uraninite).
LESURE, F.G. (1968), MICA DEPOSITS OF THE BLUE RIDGE IN NORTH CAROLINA: USGS PROFESSIONAL PAPER 577: 12.
Smithsonian Institution Mineral Reference Collection No.C5584-00 (Uraninite).


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