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Bakstevalåsen, Gunhildrud, Øvre Eiker, Buskerud, Norway

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A small 6 m long and 15-4o cm thick amazonite-pegmatite dyke found as a sill intruded into the Fossum formation.



References:
- Hurum, J. H; Jahren, J.; Berg, H.-J. & Bjerkgård, T. (1997a): En eksotisk pegmatitt i kambrosiluren ved Eikeren, Buskerud. Bergverksmuseets skrift 12, 31-33
- Hurum, J. H; Jahren, J.; Berg, H.-J. & Bjerkgaard, T. (1997b): En eksotisk pegmatitt i kambrosiluren ved Eikeren, Buskerud. STEIN 24 (3), 125-128
- Jahren, J.; Berg, H.J.; Hurum, J.H. & Wulff-Pedersen, E. (1998): Nye undersøkelser av amazonitt-genthelvin pegmatitten fra Fiskum, Øvre Eiker. Bergverksmuseets Skrift 14, 13-16




Group 2 - Sulphides and Sulfosalts
  		• Arsenopyrite2.EB.20
    FeAsS - (Fe
     
    0.90
    		Co
     
    0.10
    		)AsS
  		• Galena2.CD.10
    PbS
  		• Löllingite2.EB.15a
    FeAs
     
    2
  		• Molybdenite2.EA.30
    MoS
     
    2
  		• Tennantite2.GB.05
    (Cu,Ag,Fe,Zn)
     
    12
    		As
     
    4
    		S
     
    13
    Group 3 - Halides
  		• Fluorite3.AB.25
    CaF
     
    2
  		• Halite3.AA.20
    NaCl
  		• Hydrohalite3.BA.05
    NaCl·2H
     
    2
    		O
  		• Sylvite3.AA.20
    KCl
    Group 4 - Oxides and Hydroxides
  		• Cassiterite4.DB.05
    SnO
     
    2
  		• Columbite-(Fe)4.DB.35
    FeNb
     
    2
    		O
     
    6
  		• Goethite4.FD.10
    α-Fe
    3+
     
    		O(OH)
  		• Ilmenite4.CB.05
    Fe
    2+
     
    		TiO
     
    3
  		• Pyrochlore4.DH.15
    (Ca,Na)
     
    2
    		Nb
     
    2
    		O
     
    6
    		(OH,F)
  		• Quartz
    var: Smoky Quartz    		4.DA.05
    SiO
     
    2
    Group 7 - Sulphates, Chromates, Molybdates and Tungstates
  		• Fergusonite-(Y)7.GA.05
    YNbO
     
    4
  		• Scheelite7.GA.05
    Ca[WO
     
    4
    		]
    Group 9 - Silicates
  		• Albite9.FA.35
    Na[AlSi
     
    3
    		O
     
    8
    		]
  		• Allanite-(Ce)9.BG.05
    {CaCe}{Al
     
    2
    		Fe
    2+
     
    		}[O|OH|SiO
     
    4
    		|Si
     
    2
    		O
     
    7
    		]
  		• Andradite9.AD.25
    Ca
     
    3
    		Fe
    3+
    2
    		[SiO
     
    4
    		]
     
    3
  		• Astrophyllite9.DC.05
    (K,Na)
     
    3
    		(Fe,Mn)
     
    7
    		Ti
     
    2
    		Si
     
    8
    		O
     
    24
    		(O,OH)
     
    7
  		• Biotite9..
  		• Bustamite9.DG.05
    (Mn
    2+
     
    		,Ca)[SiO
     
    3
    		]
  		• Danburite9.FA.65
    CaB
     
    2
    		Si
     
    2
    		O
     
    8
  		• Dravite9.CK.05
    [Na][Mg
     
    3
    		][Al
     
    6
    		][(OH)
     
    3
    		|OH|(BO
     
    3
    		)
     
    3
    		|Si
     
    6
    		O
     
    18
    		]
  		• Genthelvite9.FB.10
    Zn
     
    4
    		Be
     
    3
    		[S|(SiO
     
    4
    		)
     
    3
    		]
  		• Halloysite9.ED.10
    Al
     
    2
    		Si
     
    2
    		O
     
    5
    		(OH)
     
    4
  		• Helvite ?9.FB.10
    Mn
    2+
    4
    		Be
     
    3
    		[S|(SiO
     
    4
    		)
     
    3
    		]
  		• Microcline9.FA.30
    K[AlSi
     
    3
    		O
     
    8
    		]
      var: Amazonite9.FA.30
    K[AlSi
     
    3
    		O
     
    8
    		]
  		• Phenakite9.AA.05
    Be
     
    2
    		[SiO
     
    4
    		]
  		• Schorl9.CK.05
    [Na][Fe
    2+
    3
    		][Al
     
    6
    		][(OH)
     
    3
    		|OH|(BO
     
    3
    		)
     
    3
    		|Si
     
    6
    		O
     
    18
    		]
  		• Sepiolite9.EE.25
    Mg
     
    4
    		Si
     
    6
    		O
     
    15
    		(OH)
     
    2
    		·6H
     
    2
    		O
  		• Thorite9.AD.30
    (Th,U)[SiO
     
    4
    		]
  		• Titanite9.AG.15
    CaTi[O|SiO
     
    4
    		]
  		• Zircon9.AD.30
    Zr[SiO
     
    4
    		]
    Unclassified Minerals
  		• Columbite ?-
    (Fe,Mn)(Nb,Ta)
     
    2
    		O
     
    6
  		• 'Gadolinite' ?-
  		• 'Hellandite' ?-


    39 entries listed. 34 valid minerals. 1 erroneous literature entry.

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