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Bald Knob deposit (Primary ore body; Crouse Knob deposit), Bald Knob, Sparta, Alleghany Co., North Carolina, USAi
Regional Level Types
Bald Knob deposit (Primary ore body; Crouse Knob deposit)Deposit
Bald Knob- not defined -
Sparta- not defined -
Alleghany Co.County
North CarolinaState
USACountry

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Latitude & Longitude (WGS84): 36° 32' 59'' North , 81° 5' 44'' West
Latitude & Longitude (decimal): 36.55000,-81.09583
GeoHash:G#: dnqrftez4
Locality type:Deposit
Köppen climate type:Cfb : Temperate oceanic climate
Nearest Settlements:
PlacePopulationDistance
Sparta1,726 (2017)5.4km
Independence927 (2017)9.5km
Galax6,914 (2017)19.7km
Lowgap324 (2017)20.6km
Fries469 (2017)21.2km


A manganese mine located 2½ miles East of Sparta.

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


43 valid minerals. 3 (TL) - type locality of valid minerals.

Detailed Mineral List:

Actinolite
Formula: ☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Reference: Brannock,K.C,1971,Minerals of the Spinel Group from Alleghany County,North Carolina
Alabandite
Formula: MnS
Reference: Rocks & Min.: 60:130-135.
Albite
Formula: Na(AlSi3O8)
Reference: Winter,A.Gary,Essene J.Eric and Pecor,R.Donald(1981) Carbonates and pyroxenoids from the manganese deposit near Bald knob, North Carolina: American Mineralogist, Vol.66,pp.279-280
Albite var: Andesine
Formula: (Na,Ca)[Al(Si,Al)Si2O8]
Reference: Winter,A.Gary,Essene J.Eric and Pecor,R.Donald(1981) Carbonates and pyroxenoids from the manganese deposit near Bald knob, North Carolina: American Mineralogist, Vol.66,pp.279-280
Albite var: Oligoclase
Formula: (Na,Ca)[Al(Si,Al)Si2O8]
Reference: Winter,A.Gary,Essene J.Eric and Pecor,R.Donald(1981) Carbonates and pyroxenoids from the manganese deposit near Bald knob, North Carolina: American Mineralogist, Vol.66,pp.279-280
Alleghanyite (TL)
Formula: Mn2+5(SiO4)2(OH)2
Type Locality:
Reference: Rocks & Min.: 60:130-135.
Andradite
Formula: Ca3Fe3+2(SiO4)3
Reference: Rocks & Min.: 60:130-135.
Anthophyllite
Formula: ☐{Mg2}{Mg5}(Si8O22)(OH)2
Reference: Brannock,K.C,1971,Minerals of the Spinel Group from Alleghany County,North Carolina
'Apatite'
Reference: Minerological Record ,May -June, 1981,pg 167-171
Bannisterite ?
Formula: (Ca,K,Na)(Mn2+,Fe2+)10(Si,Al)16O38(OH)8 · nH2O
Bementite
Formula: Mn7Si6O15(OH)8
Reference: Clarence S.Ross and Paul F.Kerr,1932,The Manganese Minerals of a vein near Bald Knob,North Carolina,The American Mineralogist,Vol.17,Jan 1932,No.1,pg#18
'Biotite'
Reference: Minerological Record ,May -June, 1981,pg 167-171
Calcite
Formula: CaCO3
Reference: Rocks & Min.: 21:357.
Calcite var: Manganoan Calcite
Formula: (Ca,Mn)CO3
Reference: Rocks & Min.: 60:130-135.
Caryopilite
Formula: Mn2+3Si2O5(OH)4
Reference: Rocks & Min.: 60:130-135.
Cattierite
Formula: CoS2
Reference: Rocks & Min.: 60:130-135.
Chalcopyrite
Formula: CuFeS2
Reference: Rocks & Min.: 60:130-135.
'Chlorite Group'
Reference: Brannock,K.C,1971,Minerals of the Spinel Group from Alleghany County,North Carolina
Clino-suenoite
Formula: □{Mn2+2}{Mg5}(Si8O22)(OH)2
Description: Can be a synonym in some older references as Tirodite.
Reference: Winter,A.Gary,Essene,J.Eric,and Pecor.R.Donald,1981,Carbonates and pyroxenoids from the manganese deposit near Bald Knob,North Carolina. America Mineralogist,Vol66,pg.278-289,1981,pg#279
Cobaltite
Formula: CoAsS
Reference: Rocks & Min.: 60:130-135.
Cummingtonite
Formula: ☐{Mg2}{Mg5}(Si8O22)(OH)2
Reference: Winter,A.Gary,Essene J.Eric and Pecor,R.Donald(1981) Carbonates and pyroxenoids from the manganese deposit near Bald knob, North Carolina: American Mineralogist, Vol.66,pp.279-280
Fluorapatite
Formula: Ca5(PO4)3F
Reference: Rocks & Min.: 60:130-135.
Galaxite (TL)
Formula: Mn2+Al2O4
Type Locality:
Description: Galaxite and Jacobsite can be as intergrowths or as sepearate grains.
Reference: Rocks & Min.: 60:130-135.
'Garnet Group'
Formula: X3Z2(SiO4)3
Reference: Winter,A.Gary,Essene J.Eric and Pecor,R.Donald(1981) Carbonates and pyroxenoids from the manganese deposit near Bald knob, North Carolina: American Mineralogist, Vol.66,pp.279-280
Grunerite
Formula: ☐{Fe2+2}{Fe2+5}(Si8O22)(OH)2
Reference: Brannock,K.G,1971,Minerals of the Spinel Group from Alleghany County,North Carolina,pg 43
'Hornblende'
Reference: Minerological Record ,May -June, 1981,pg 167-171
Jacobsite
Formula: Mn2+Fe3+2O4
Reference: Rocks & Min.: 60:130-135.
Kellyite (TL)
Formula: Mn2+2Al(AlSiO5)(OH)4
Type Locality:
Reference: Peacor, D. R., Essene, E. J., Simmons, W. B., Bigelow, W. C. (1974): Kellyite, a new Mn-Al member of the serpentine group from Bald Knob, North Carolina, and new data on grovesite. American Mineralogist 59, 1153-1156.; Rocks & Min.: 60:130-135.
Kutnohorite
Formula: CaMn2+(CO3)2
Reference: Rocks & Min.: 60:130-135; Peacor, D. R., Essene, E. J., Gaines, A. M. (1987): Petrologic and crystal-chemical implications of cation order-disorder in kutnahorite [CaMn(CO3)2]. American Mineralogist 72, 319-328.
Linnaeite
Formula: Co2+Co3+2S4
Reference: Frank K. Mazdab collection (see https://www.rockptx.com/fkm-226-to-fkm-250/#FKM-243 for normalized analysis)
Magnetite
Formula: Fe2+Fe3+2O4
Reference: Clarence S.Ross.Paul F.Kerr,Jan 1932,The Manganese minerals of a vein near Bald Knob,North Carolina,America Mineralogist,Vol.17,No 1
Manganhumite
Formula: (Mn2+,Mg)7(SiO4)3(OH)2
Reference: Rocks & Min.: 60:130-135.
Manganogrunerite
Formula: ☐{Mn2+2}{Fe2+5}(Si8O22)(OH)2
Reference: Brannock,K.C,1971,Minerals of the Spinel Group from Alleghany County,North Carolina
Margarite
Formula: CaAl2(Al2Si2O10)(OH)2
Reference: Brannock,K.C,1971,Minerals of the Spinel Group from Alleghany County,North Carolina
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Minerological Record ,May -June, 1981,pg 167-171
Neotocite
Formula: (Mn,Fe,Mg)SiO3 · H2O
Reference: Clarence S.Ross.Paul F.Kerr,Jan 1932,The Manganese minerals of a vein near Bald Knob,North Carolina,America Mineralogist,Vol.17,No 1
Pennantite
Formula: Mn2+5Al(AlSi3O10)(OH)8
Reference: Rocks & Min.: 60:130-135.; Bayliss, P. (1983). Polytypes of pennantite. Canadian Mineralogist, 21(3), 545-547.
Phlogopite
Formula: KMg3(AlSi3O10)(OH)2
Reference: Brannock,K.C,1971,Minerals of the Spinel Group from Alleghany County,North Carolina
Pyrite
Formula: FeS2
Reference: Brannock,K.C,1971,Minerals of the Spinel Group from Alleghany County,North Carolina
Pyrolusite
Formula: Mn4+O2
Reference: Clarence S.Ross.Paul F.Kerr,Jan 1932,The Manganese minerals of a vein near Bald Knob,North Carolina,America Mineralogist,Vol.17,No 1
Pyrophanite
Formula: Mn2+TiO3
Reference: [MinRec 12:171]
Pyroxmangite
Formula: MnSiO3
Reference: Rocks & Min.: 60:130-135.
Pyrrhotite
Formula: Fe7S8
Reference: Brannock,K.C,1971,Minerals of the Spinel Group from Alleghany County,North Carolina
Quartz
Formula: SiO2
Reference: Rocks & Min.: 60:130-135.
Rhodochrosite
Formula: MnCO3
Reference: Rocks & Min.: 60:130-135.
Rhodonite
Formula: Mn2+SiO3
Reference: Rocks & Min.: 60:130-135.
Sonolite
Formula: Mn2+9(SiO4)4(OH)2
Reference: Rocks & Min.: 60:130-135.
Spessartine
Formula: Mn2+3Al2(SiO4)3
Reference: Rocks & Min.: 60:130-135.
Stilpnomelane
Formula: (K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Reference: Rocks & Min.: 60:130-135.
Stilpnomelane var: Manganoan Stilpnomelane
Formula: K(Fe2+,Mn,Mg,Fe3+)8(Si,Al)12(O,OH)27
Reference: Rocks & Min.: 60:130-135.
Tephroite
Formula: Mn2+2SiO4
Reference: Rocks & Min.: 60:130-135.
Trimerite ?
Formula: CaMn2+2Be3(SiO4)3
Reference: Jan H.Bernard and Jaroslav Hyrsl,2004, Minerals and their Localities,pg # 694

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Alabandite2.CD.10MnS
Cattierite2.EB.05aCoS2
Chalcopyrite2.CB.10aCuFeS2
Cobaltite2.EB.25CoAsS
Linnaeite2.DA.05Co2+Co3+2S4
Pyrite2.EB.05aFeS2
Pyrrhotite2.CC.10Fe7S8
Group 4 - Oxides and Hydroxides
Galaxite (TL)4.BB.05Mn2+Al2O4
Jacobsite4.BB.05Mn2+Fe3+2O4
Magnetite4.BB.05Fe2+Fe3+2O4
Pyrolusite4.DB.05Mn4+O2
Pyrophanite4.CB.05Mn2+TiO3
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
var: Manganoan Calcite5.AB.05(Ca,Mn)CO3
Kutnohorite5.AB.10CaMn2+(CO3)2
Rhodochrosite5.AB.05MnCO3
Group 8 - Phosphates, Arsenates and Vanadates
Fluorapatite8.BN.05Ca5(PO4)3F
Group 9 - Silicates
Actinolite9.DE.10☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Albite9.FA.35Na(AlSi3O8)
var: Andesine9.FA.35(Na,Ca)[Al(Si,Al)Si2O8]
var: Oligoclase9.FA.35(Na,Ca)[Al(Si,Al)Si2O8]
Alleghanyite (TL)9.AF.45Mn2+5(SiO4)2(OH)2
Andradite9.AD.25Ca3Fe3+2(SiO4)3
Anthophyllite9.DD.05☐{Mg2}{Mg5}(Si8O22)(OH)2
Bannisterite ?9.EG.75(Ca,K,Na)(Mn2+,Fe2+)10(Si,Al)16O38(OH)8 · nH2O
Bementite9.EE.05Mn7Si6O15(OH)8
Caryopilite9.ED.15Mn2+3Si2O5(OH)4
Clino-suenoite9.DE.□{Mn2+2}{Mg5}(Si8O22)(OH)2
Cummingtonite9.DE.05☐{Mg2}{Mg5}(Si8O22)(OH)2
Grunerite9.DE.05☐{Fe2+2}{Fe2+5}(Si8O22)(OH)2
Kellyite (TL)9.ED.15Mn2+2Al(AlSiO5)(OH)4
Manganhumite9.AF.50(Mn2+,Mg)7(SiO4)3(OH)2
Margarite9.EC.30CaAl2(Al2Si2O10)(OH)2
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
Neotocite9.ED.20(Mn,Fe,Mg)SiO3 · H2O
Pennantite9.EC.55Mn2+5Al(AlSi3O10)(OH)8
Phlogopite9.EC.20KMg3(AlSi3O10)(OH)2
Pyroxmangite9.DO.05MnSiO3
Rhodonite9.DK.05Mn2+SiO3
Sonolite9.AF.55Mn2+9(SiO4)4(OH)2
Spessartine9.AD.25Mn2+3Al2(SiO4)3
Stilpnomelane9.EG.40(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
var: Manganoan Stilpnomelane9.EG.40K(Fe2+,Mn,Mg,Fe3+)8(Si,Al)12(O,OH)27
Tephroite9.AC.05Mn2+2SiO4
Trimerite ?9.AB.05CaMn2+2Be3(SiO4)3
Unclassified Minerals, Rocks, etc.
'Apatite'-
'Biotite'-
'Chlorite Group'-
'Garnet Group'-X3Z2(SiO4)3
'Hornblende'-
Manganogrunerite-☐{Mn2+2}{Fe2+5}(Si8O22)(OH)2

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Alabandite2.8.1.4MnS
Pyrrhotite2.8.10.1Fe7S8
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 3:4
Linnaeite2.10.1.1Co2+Co3+2S4
AmBnXp, with (m+n):p = 1:2
Cattierite2.12.1.3CoS2
Cobaltite2.12.3.1CoAsS
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
A2X3
Pyrophanite4.3.5.3Mn2+TiO3
AX2
Pyrolusite4.4.1.4Mn4+O2
Group 7 - MULTIPLE OXIDES
AB2X4
Galaxite (TL)7.2.1.2Mn2+Al2O4
Jacobsite7.2.2.2Mn2+Fe3+2O4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Rhodochrosite14.1.1.4MnCO3
AB(XO3)2
Kutnohorite14.2.1.3CaMn2+(CO3)2
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
A5(XO4)3Zq
Fluorapatite41.8.1.1Ca5(PO4)3F
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [4] as well as >[4]
Trimerite ?51.2.1.1CaMn2+2Be3(SiO4)3
Insular SiO4 Groups Only with all cations in octahedral [6] coordination
Tephroite51.3.1.4Mn2+2SiO4
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Andradite51.4.3b.1Ca3Fe3+2(SiO4)3
Spessartine51.4.3a.3Mn2+3Al2(SiO4)3
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] coordination only
Alleghanyite (TL)52.3.2b.1Mn2+5(SiO4)2(OH)2
Manganhumite52.3.2c.3(Mn2+,Mg)7(SiO4)3(OH)2
Sonolite52.3.2d.3Mn2+9(SiO4)4(OH)2
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=5
Rhodonite65.4.1.1Mn2+SiO3
Single-Width Unbranched Chains, W=1 with chains P=7
Pyroxmangite65.6.1.1MnSiO3
Group 66 - INOSILICATES Double-Width,Unbranched Chains,(W=2)
Amphiboles - Mg-Fe-Mn-Li subgroup
Anthophyllite66.1.2.1☐{Mg2}{Mg5}(Si8O22)(OH)2
Cummingtonite66.1.1.1☐{Mg2}{Mg5}(Si8O22)(OH)2
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 1:1 layers
Caryopilite71.1.2b.1Mn2+3Si2O5(OH)4
Kellyite (TL)71.1.2c.5Mn2+2Al(AlSiO5)(OH)4
Neotocite71.1.5.4(Mn,Fe,Mg)SiO3 · H2O
Sheets of 6-membered rings with 2:1 layers
Margarite71.2.2c.1CaAl2(Al2Si2O10)(OH)2
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Phlogopite71.2.2b.1KMg3(AlSi3O10)(OH)2
Sheets of 6-membered rings interlayered 1:1, 2:1, and octahedra
Pennantite71.4.1.8Mn2+5Al(AlSi3O10)(OH)8
Group 74 - PHYLLOSILICATES Modulated Layers
Modulated Layers with joined islands
Bannisterite ?74.1.1.4(Ca,K,Na)(Mn2+,Fe2+)10(Si,Al)16O38(OH)8 · nH2O
Stilpnomelane74.1.1.1(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite76.1.3.1Na(AlSi3O8)
Group 78 - Unclassified Silicates
Bementite78.5.2.1Mn7Si6O15(OH)8
Unclassified Minerals, Mixtures, etc.
Actinolite-☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Albite
var: Andesine
-(Na,Ca)[Al(Si,Al)Si2O8]
var: Oligoclase-(Na,Ca)[Al(Si,Al)Si2O8]
'Apatite'-
'Biotite'-
Calcite
var: Manganoan Calcite
-(Ca,Mn)CO3
'Chlorite Group'-
Clino-suenoite-□{Mn2+2}{Mg5}(Si8O22)(OH)2
'Garnet Group'-X3Z2(SiO4)3
Grunerite-☐{Fe2+2}{Fe2+5}(Si8O22)(OH)2
'Hornblende'-
Manganogrunerite-☐{Mn2+2}{Fe2+5}(Si8O22)(OH)2
Stilpnomelane
var: Manganoan Stilpnomelane
-K(Fe2+,Mn,Mg,Fe3+)8(Si,Al)12(O,OH)27

List of minerals for each chemical element

HHydrogen
H AlleghanyiteMn52+(SiO4)2(OH)2
H KellyiteMn22+Al(AlSiO5)(OH)4
H SonoliteMn92+(SiO4)4(OH)2
H Manganhumite(Mn2+,Mg)7(SiO4)3(OH)2
H CaryopiliteMn32+Si2O5(OH)4
H PennantiteMn52+Al(AlSi3O10)(OH)8
H Stilpnomelane (var: Manganoan Stilpnomelane)K(Fe2+,Mn,Mg,Fe3+)8(Si,Al)12(O,OH)27
H BementiteMn7Si6O15(OH)8
H MuscoviteKAl2(AlSi3O10)(OH)2
H Grunerite☐{Fe22+}{Fe52+}(Si8O22)(OH)2
H Anthophyllite☐{Mg2}{Mg5}(Si8O22)(OH)2
H Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
H PhlogopiteKMg3(AlSi3O10)(OH)2
H MargariteCaAl2(Al2Si2O10)(OH)2
H Manganogrunerite☐{Mn22+}{Fe52+}(Si8O22)(OH)2
H Clino-suenoite□{Mn22+}{Mg5}(Si8O22)(OH)2
H Neotocite(Mn,Fe,Mg)SiO3 · H2O
H Cummingtonite☐{Mg2}{Mg5}(Si8O22)(OH)2
H Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
H Bannisterite(Ca,K,Na)(Mn2+,Fe2+)10(Si,Al)16O38(OH)8 · nH2O
BeBeryllium
Be TrimeriteCaMn22+Be3(SiO4)3
CCarbon
C Calcite (var: Manganoan Calcite)(Ca,Mn)CO3
C KutnohoriteCaMn2+(CO3)2
C RhodochrositeMnCO3
C CalciteCaCO3
OOxygen
O AlleghanyiteMn52+(SiO4)2(OH)2
O KellyiteMn22+Al(AlSiO5)(OH)4
O GalaxiteMn2+Al2O4
O PyrophaniteMn2+TiO3
O SpessartineMn32+Al2(SiO4)3
O QuartzSiO2
O Calcite (var: Manganoan Calcite)(Ca,Mn)CO3
O KutnohoriteCaMn2+(CO3)2
O RhodochrositeMnCO3
O SonoliteMn92+(SiO4)4(OH)2
O Manganhumite(Mn2+,Mg)7(SiO4)3(OH)2
O TephroiteMn22+SiO4
O CaryopiliteMn32+Si2O5(OH)4
O RhodoniteMn2+SiO3
O PyroxmangiteMnSiO3
O AndraditeCa3Fe23+(SiO4)3
O PennantiteMn52+Al(AlSi3O10)(OH)8
O JacobsiteMn2+Fe23+O4
O FluorapatiteCa5(PO4)3F
O Stilpnomelane (var: Manganoan Stilpnomelane)K(Fe2+,Mn,Mg,Fe3+)8(Si,Al)12(O,OH)27
O CalciteCaCO3
O BementiteMn7Si6O15(OH)8
O MuscoviteKAl2(AlSi3O10)(OH)2
O Grunerite☐{Fe22+}{Fe52+}(Si8O22)(OH)2
O Anthophyllite☐{Mg2}{Mg5}(Si8O22)(OH)2
O Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
O PhlogopiteKMg3(AlSi3O10)(OH)2
O MargariteCaAl2(Al2Si2O10)(OH)2
O Manganogrunerite☐{Mn22+}{Fe52+}(Si8O22)(OH)2
O Clino-suenoite□{Mn22+}{Mg5}(Si8O22)(OH)2
O Neotocite(Mn,Fe,Mg)SiO3 · H2O
O PyrolusiteMn4+O2
O MagnetiteFe2+Fe23+O4
O Albite (var: Andesine)(Na,Ca)[Al(Si,Al)Si2O8]
O Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
O Cummingtonite☐{Mg2}{Mg5}(Si8O22)(OH)2
O Garnet GroupX3Z2(SiO4)3
O Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
O AlbiteNa(AlSi3O8)
O Bannisterite(Ca,K,Na)(Mn2+,Fe2+)10(Si,Al)16O38(OH)8 · nH2O
O TrimeriteCaMn22+Be3(SiO4)3
FFluorine
F FluorapatiteCa5(PO4)3F
NaSodium
Na Albite (var: Andesine)(Na,Ca)[Al(Si,Al)Si2O8]
Na Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Na Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Na AlbiteNa(AlSi3O8)
Na Bannisterite(Ca,K,Na)(Mn2+,Fe2+)10(Si,Al)16O38(OH)8 · nH2O
MgMagnesium
Mg Manganhumite(Mn2+,Mg)7(SiO4)3(OH)2
Mg Stilpnomelane (var: Manganoan Stilpnomelane)K(Fe2+,Mn,Mg,Fe3+)8(Si,Al)12(O,OH)27
Mg Anthophyllite☐{Mg2}{Mg5}(Si8O22)(OH)2
Mg Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Mg PhlogopiteKMg3(AlSi3O10)(OH)2
Mg Clino-suenoite□{Mn22+}{Mg5}(Si8O22)(OH)2
Mg Neotocite(Mn,Fe,Mg)SiO3 · H2O
Mg Cummingtonite☐{Mg2}{Mg5}(Si8O22)(OH)2
Mg Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
AlAluminium
Al KellyiteMn22+Al(AlSiO5)(OH)4
Al GalaxiteMn2+Al2O4
Al SpessartineMn32+Al2(SiO4)3
Al PennantiteMn52+Al(AlSi3O10)(OH)8
Al Stilpnomelane (var: Manganoan Stilpnomelane)K(Fe2+,Mn,Mg,Fe3+)8(Si,Al)12(O,OH)27
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al PhlogopiteKMg3(AlSi3O10)(OH)2
Al MargariteCaAl2(Al2Si2O10)(OH)2
Al Albite (var: Andesine)(Na,Ca)[Al(Si,Al)Si2O8]
Al Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Al Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Al AlbiteNa(AlSi3O8)
Al Bannisterite(Ca,K,Na)(Mn2+,Fe2+)10(Si,Al)16O38(OH)8 · nH2O
SiSilicon
Si AlleghanyiteMn52+(SiO4)2(OH)2
Si KellyiteMn22+Al(AlSiO5)(OH)4
Si SpessartineMn32+Al2(SiO4)3
Si QuartzSiO2
Si SonoliteMn92+(SiO4)4(OH)2
Si Manganhumite(Mn2+,Mg)7(SiO4)3(OH)2
Si TephroiteMn22+SiO4
Si CaryopiliteMn32+Si2O5(OH)4
Si RhodoniteMn2+SiO3
Si PyroxmangiteMnSiO3
Si AndraditeCa3Fe23+(SiO4)3
Si PennantiteMn52+Al(AlSi3O10)(OH)8
Si Stilpnomelane (var: Manganoan Stilpnomelane)K(Fe2+,Mn,Mg,Fe3+)8(Si,Al)12(O,OH)27
Si BementiteMn7Si6O15(OH)8
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si Grunerite☐{Fe22+}{Fe52+}(Si8O22)(OH)2
Si Anthophyllite☐{Mg2}{Mg5}(Si8O22)(OH)2
Si Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Si PhlogopiteKMg3(AlSi3O10)(OH)2
Si MargariteCaAl2(Al2Si2O10)(OH)2
Si Manganogrunerite☐{Mn22+}{Fe52+}(Si8O22)(OH)2
Si Clino-suenoite□{Mn22+}{Mg5}(Si8O22)(OH)2
Si Neotocite(Mn,Fe,Mg)SiO3 · H2O
Si Albite (var: Andesine)(Na,Ca)[Al(Si,Al)Si2O8]
Si Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Si Cummingtonite☐{Mg2}{Mg5}(Si8O22)(OH)2
Si Garnet GroupX3Z2(SiO4)3
Si Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Si AlbiteNa(AlSi3O8)
Si Bannisterite(Ca,K,Na)(Mn2+,Fe2+)10(Si,Al)16O38(OH)8 · nH2O
Si TrimeriteCaMn22+Be3(SiO4)3
PPhosphorus
P FluorapatiteCa5(PO4)3F
SSulfur
S CattieriteCoS2
S CobaltiteCoAsS
S AlabanditeMnS
S ChalcopyriteCuFeS2
S PyriteFeS2
S PyrrhotiteFe7S8
S LinnaeiteCo2+Co23+S4
KPotassium
K Stilpnomelane (var: Manganoan Stilpnomelane)K(Fe2+,Mn,Mg,Fe3+)8(Si,Al)12(O,OH)27
K MuscoviteKAl2(AlSi3O10)(OH)2
K PhlogopiteKMg3(AlSi3O10)(OH)2
K Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
K Bannisterite(Ca,K,Na)(Mn2+,Fe2+)10(Si,Al)16O38(OH)8 · nH2O
CaCalcium
Ca Calcite (var: Manganoan Calcite)(Ca,Mn)CO3
Ca KutnohoriteCaMn2+(CO3)2
Ca AndraditeCa3Fe23+(SiO4)3
Ca FluorapatiteCa5(PO4)3F
Ca CalciteCaCO3
Ca Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Ca MargariteCaAl2(Al2Si2O10)(OH)2
Ca Albite (var: Andesine)(Na,Ca)[Al(Si,Al)Si2O8]
Ca Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Ca Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Ca Bannisterite(Ca,K,Na)(Mn2+,Fe2+)10(Si,Al)16O38(OH)8 · nH2O
Ca TrimeriteCaMn22+Be3(SiO4)3
TiTitanium
Ti PyrophaniteMn2+TiO3
MnManganese
Mn AlleghanyiteMn52+(SiO4)2(OH)2
Mn KellyiteMn22+Al(AlSiO5)(OH)4
Mn GalaxiteMn2+Al2O4
Mn PyrophaniteMn2+TiO3
Mn SpessartineMn32+Al2(SiO4)3
Mn Calcite (var: Manganoan Calcite)(Ca,Mn)CO3
Mn KutnohoriteCaMn2+(CO3)2
Mn RhodochrositeMnCO3
Mn SonoliteMn92+(SiO4)4(OH)2
Mn Manganhumite(Mn2+,Mg)7(SiO4)3(OH)2
Mn TephroiteMn22+SiO4
Mn CaryopiliteMn32+Si2O5(OH)4
Mn RhodoniteMn2+SiO3
Mn PyroxmangiteMnSiO3
Mn PennantiteMn52+Al(AlSi3O10)(OH)8
Mn JacobsiteMn2+Fe23+O4
Mn AlabanditeMnS
Mn Stilpnomelane (var: Manganoan Stilpnomelane)K(Fe2+,Mn,Mg,Fe3+)8(Si,Al)12(O,OH)27
Mn BementiteMn7Si6O15(OH)8
Mn Manganogrunerite☐{Mn22+}{Fe52+}(Si8O22)(OH)2
Mn Clino-suenoite□{Mn22+}{Mg5}(Si8O22)(OH)2
Mn Neotocite(Mn,Fe,Mg)SiO3 · H2O
Mn PyrolusiteMn4+O2
Mn Bannisterite(Ca,K,Na)(Mn2+,Fe2+)10(Si,Al)16O38(OH)8 · nH2O
Mn TrimeriteCaMn22+Be3(SiO4)3
FeIron
Fe AndraditeCa3Fe23+(SiO4)3
Fe JacobsiteMn2+Fe23+O4
Fe ChalcopyriteCuFeS2
Fe Stilpnomelane (var: Manganoan Stilpnomelane)K(Fe2+,Mn,Mg,Fe3+)8(Si,Al)12(O,OH)27
Fe Grunerite☐{Fe22+}{Fe52+}(Si8O22)(OH)2
Fe Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Fe PyriteFeS2
Fe PyrrhotiteFe7S8
Fe Manganogrunerite☐{Mn22+}{Fe52+}(Si8O22)(OH)2
Fe Neotocite(Mn,Fe,Mg)SiO3 · H2O
Fe MagnetiteFe2+Fe23+O4
Fe Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Fe Bannisterite(Ca,K,Na)(Mn2+,Fe2+)10(Si,Al)16O38(OH)8 · nH2O
CoCobalt
Co CattieriteCoS2
Co CobaltiteCoAsS
Co LinnaeiteCo2+Co23+S4
CuCopper
Cu ChalcopyriteCuFeS2
AsArsenic
As CobaltiteCoAsS

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

Cambrian - Neoproterozoic
485.4 - 1000 Ma



ID: 3190533
Precambrian-Phanerozoic sedimentary and volcanic rocks

Age: Neoproterozoic to Cambrian (485.4 - 1000 Ma)

Lithology: Metasedimentary/metavolcanic schist

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]

Neoproterozoic
541 - 1000 Ma



ID: 2844561
Ashe Metamorphic Suite and Tallulah Falls Formation; Muscovite-biotite gneiss

Age: Neoproterozoic (541 - 1000 Ma)

Stratigraphic Name: Ashe Metamorphic Suite; Tallulah Falls Formation

Description: Locally sulfidic; interlayered and gradational with mica schist, minor amphibolite, and hornblende gneiss.

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,mica schist}, Minor:{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]

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)
Ross, C.S. and Kerr, P.F. (1932) The manganese minerals of a vein near Bald Knob, North Carolina. American Mineralogist 17, 1-18.
Rocks & Minerals (1946) 21: 357.
Brannock, K.C. (1971) Minerals of the Spinel Group from Alleghany County, North Carolina.
Peacor, D. R., Essene, E. J., Simmons, W. B., Bigelow, W. C. (1974): Kellyite, a new Mn-Al member of the serpentine group from Bald Knob, North Carolina, and new data on grovesite. American Mineralogist 59, 1153-1156.
Simmons, W.B., Peacor, D.R., Essene, E.J., and Winter, G.A. (1981) Manganese minerals of Bald Knob, North Carolina. Mineralogical Record 12, 167-171.
Winter, G.A., Essene, E.J., and Peacor, D.R. (1981) Carbonates and pyroxenoids from the manganese deposit near Bald Knob, North Carolina. American Mineralogist 66, 278-289.
Winter, G.A., Essene, E.J. and Peacor, D.R. (1983) Mn-humites from Bald Knob, North Carolina: mineralogy and phase equilibria. American Mineralogist 68, 957-959.
Rocks & Minerals (1985) 60: 130-135.
Flohr, M.J.K. (1992) Geochemistry and origin of the Bald Knob manganese deposit, North Carolina. Economic Geology 87, 2023-2040.
Bernard, J.H. and Hyrsl, J. (2004) Minerals and Their Localities: 694.


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