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Bald Knob Deposit (Primary Ore Body; Crouse Knob Deposit), Bald Knob, Sparta, Alleghany Co., North Carolina, USA

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A manganese mine located 2½ miles East of Sparta.



References:
Econ Geol (1992) 87:2023-2040
Rocks & Min.: 21:357
Rocks & Min.: 60:130-135
Peacor, D. et al. (1974)
- Simmons,W.B. et al. (1981): Manganese Minerals of Bald Knob, North Carolina. Mineralogical Record 12, 167-171.





 Map Reference: 36°33'0"N , 81°5'45"W

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Group 2 - Sulphides and Sulfosalts
  		• Alabandite2.CD.10
    Mn
    2+
     
    		S
  		• Cattierite2.EB.05a
    CoS
     
    2
  		• Chalcopyrite2.CB.10a
    CuFeS
     
    2
  		• Cobaltite2.EB.25
    CoAsS
  		• Pyrite2.EB.05a
    FeS
     
    2
  		• Pyrrhotite2.CC.10
    Fe
     
    7
    		S
     
    8
    		, (-4M), also given as Fe
     
    1-x
    		S (x = 0 - 0.2)
    Group 4 - Oxides and Hydroxides
  		• Galaxite (TL)4.BB.05
    (Mn,Fe,Mg)(Al,Fe)
     
    2
    		O
     
    4
  		• Jacobsite4.BB.05
    Mn
    2+
     
    		Fe
    3+
    2
    		O
     
    4
  		• Magnetite4.BB.05
    Fe
    2+
     
    		Fe
    3+
    2
    		O
     
    4
  		• Pyrolusite4.DB.05
    MnO
     
    2
  		• Pyrophanite4.CB.05
    Mn
    2+
     
    		TiO
     
    3
  		• Quartz4.DA.05
    SiO
     
    2
    Group 5 - Nitrates and Carbonates
  		• Calcite5.AB.05
    CaCO
     
    3
      var: Manganoan Calcite5.AB.05
    (Ca,Mn)CO
     
    3
  		• Kutnohorite5.AB.10
    Ca(Mn,Mg,Fe)(CO
     
    3
    		)
     
    2
  		• Rhodochrosite5.AB.05
    MnCO
     
    3
    Group 8 - Phosphates, Arsenates and Vanadates
  		• Apatite-(CaF)8.BN.05
    Ca
     
    5
    		[F|(PO
     
    4
    		)
     
    3
    		]
    Group 9 - Silicates
  		• Actinolite9.DE.10
    ☐Ca
     
    2
    		(Mg,Fe
    2+
     
    		)
     
    5
    		(Si
     
    8
    		O
     
    22
    		)(OH)
     
    2
  		• Alleghanyite (TL)9.AF.45
    Mn
    2+
    5
    		[(OH)
     
    2
    		|(SiO
     
    4
    		)
     
    2
    		]
  		• Andradite9.AD.25
    Ca
     
    3
    		Fe
    3+
    2
    		[SiO
     
    4
    		]
     
    3
  		• Anthophyllite9.DE.05
    ☐[Mg
     
    2
    		][Mg
     
    5
    		][(OH)
     
    2
    		|Si
     
    8
    		O
     
    22
    		]
  		• Bannisterite ?9.EG.75
    Ca
     
    0.5
    		(K,Na)
     
    0.5
    		(Mn,Fe,Zn)
     
    10
    		(Si,Al)
     
    16
    		O
     
    38
    		(OH)
     
    8
    		·5.5H
     
    2
    		O
  		• Bementite9.EE.05
    Mn
     
    5
    		Si
     
    4
    		O
     
    10
    		(OH)
     
    6
  		• Biotite9..
  		• Caryopilite9.ED.15
    (Mn,Mg)
     
    3
    		Si
     
    2
    		O
     
    5
    		(OH)
     
    4
  		• Grunerite9.DE.05
    [ ][Fe
    2+
    2
    		][Fe
    2+
    5
    		][(OH)
     
    2
    		|Si
     
    8
    		O
     
    22
    		]
  		• Kellyite (TL)9.ED.15
    Mn
    2+
    2
    		Al[(OH)
     
    4
    		|AlSiO
     
    5
    		]
  		• Manganhumite9.AF.50
    (Mn
    2+
     
    		,Mg)
     
    7
    		[(OH)
     
    2
    		|(SiO
     
    4
    		)
     
    3
    		]
  		• Manganocummingtonite9.DE.05
    [ ][Mn
    2+
    2
    		][Mg
     
    5
    		][(OH)
     
    2
    		|Si
     
    8
    		O
     
    22
    		]
  		• Manganogrunerite9.DE.05
    [ ][Mn
    2+
    2
    		][Fe
    2+
    5
    		][(OH)
     
    2
    		|Si
     
    8
    		O
     
    22
    		]
  		• Margarite9.EC.30
    CaAl
     
    2
    		[(OH)
     
    2
    		|Al
     
    2
    		Si
     
    2
    		O
     
    10
    		]
  		• Muscovite9.EC.15
    KAl
     
    2
    		[(OH)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
  		• Neotocite9.ED.20
    (Mn,Fe,Mg)SiO
     
    3
    		·H
     
    2
    		O
  		• Pennantite9.EC.55
    (Mn
     
    5
    		Al)(Si
     
    3
    		Al)O
     
    10
    		(OH)
     
    8
  		• Phlogopite9.EC.20
    KMg
     
    3
    		[(OH,F)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
  		• Pyroxmangite9.DO.05
    MnSiO
     
    3
  		• Rhodonite9.DK.05
    MnSiO
     
    3
  		• Sonolite9.AF.55
    Mn
    2+
    9
    		[(OH,F)
     
    2
    		|(SiO
     
    4
    		)
     
    4
    		]
  		• Spessartine9.AD.25
    Mn
    2+
    3
    		Al
     
    2
    		[SiO
     
    4
    		]
     
    3
  		• Stilpnomelane
    var: Manganoan Stilpnomelane    		9.EG.40
    K(Fe
    2+
     
    		,Mn,Mg,Fe
    3+
     
    		)
     
    8
    		(Si,Al)
     
    12
    		(O,OH)
     
    27
  		• Tephroite9.AC.05
    Mn
    2+
    2
    		[SiO
     
    4
    		]
  		• Trimerite ?9.AB.05
    CaMn
    2+
    2
    		Be
     
    3
    		[SiO
     
    4
    		]
     
    3
    Unclassified Minerals
  		• 'Apatite'-
  		• 'Chlorite Group'-
  		• 'Hornblende'-


    45 entries listed. 41 valid minerals.

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