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Gjerdingselva (Gjerdingen), Nordmarka, Lunner, Oppland, Norway

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The locality is located about 1 km east of the Lake Gjerdingen, and consists as small outcrops/roadcuts beside the dirtroad from Lake Gjerdingen, close to Gjerdingenelva (river), going to Stryken station. It is a part of the "ekerite" (a soda granite) rich in zirconium, titanium and fluorine; locally occuring as an "elpidite-ekerite" and very locally as a "janhaugite-elpidite-ekerite".



References:
- Sæbø, P. Chr. (1966): A short comment on some Norwegian mineral deposits within the Igneous Rock Complex of the Oslo Region. Norsk Geologisk Tidsskrift 46, 260-261

- Raade, G. (1972): Mineralogy of the miarolitic cavities in the plutonic rock of the Oslo Region. Mineralogical Record 3, 7-11.

- Raade, G. & Haug, J. (1980): Rare Fluorides from a soda granite in the Oslo Region, Norway. Mineralogical Record, 11, 83-91

- Raade, G. & Haug, J. (1981): Morphology and twinning of sellaite from Gjerdingen, Norway. Mineralogical Record 12, 231-232

- Eldjarn, K. (1981): Drusemineraler fra Gjerdingen i Nordmarka. NAGS-nytt 8 (2), 6-10 (in norwegian)

- Eldjarn, K. (1981): Kryolitt fra Gjerdingen i Nordmarka. NAGS-nytt 8 (2), 11-12 (in norwegian)

- Raade, G. & Haug, J. (1982): Gjerdingen. Fundstelle seltener Mineralien in Norwegen. LAPIS 7 (6), 9-15

- Raade, G. & Mladeck, M. H. (1983): Janhaugite,.. A new mineral from Norway. American Mineralogist 68, 1216-1219.

- Ljøstad, O.T. (1988): Doyleitt. NAGS-nytt 15 (1-4), 23

- Raade, G., Ferraris, G., Gula. A. & Ivaldi, G. (2002): Gjerdingenite-Fe from Norway, a new mineral species in the labuntsovite group: description, crystal structure and twinning. Canadian Mineralogist 40, 1629-1639

- Raade, G., Chukanov N.V., Kolitsch U., Möckel S., Zadov, A.E., Pekov I.V. (2004): Gjerdingenite-Mn from Norway - a new mineral species in the labuntsovite group: descriptive data and crystal structure. European Journal of Mineralogy, 16, 979-987.

- Raade, G. (2005): Gjerdingen-ekeritten, en unik mineralforekomst. [The Gjerdingen-ekerite, a unique minerallocality]. Bergverksmuseets Skrift (Norsk Bergverksmuseum) 30, 14-18.

- Raade, G. (2009): Plumbopyrochlore, ceriopyrochlore-(Ce), wulfenite and andradite from the Gjerdingen ekerite. Bergverksmuseets Skrift (Norsk Bergverksmuseum) 41, 25-30.

- http://www.koeln.netsurf.de/~w.steffens/gjerd.htm




Group 1 - Elements
  		• Sulphur1.CC.05
    S
     
    8
    Group 2 - Sulphides and Sulfosalts
  		• Galena2.CD.10
    PbS
  		• Marcasite2.EB.10a
    FeS
     
    2
  		• Molybdenite2.EA.30
    MoS
     
    2
  		• Pyrite2.EB.05a
    FeS
     
    2
  		• Sphalerite2.CB.05a
    (Zn,Fe
    2+
     
    		)S
    Group 3 - Halides
  		• Cryolite3.CB.15
    Na
     
    3
    		[AlF
     
    6
    		]
  		• Fluorite3.AB.25
    CaF
     
    2
  		• Gagarinite-(Y)3.AB.35
    NaCaY(F,Cl)
     
    6
  		• Gearksutite3.CC.05
    Ca[Al(F,OH)
     
    5
    		(H
     
    2
    		O)]
  		• Neighborite3.AA.35
    NaMgF
     
    3
  		• Pachnolite3.CB.40
    NaCaAlF
     
    6
    		·H
     
    2
    		O
  		• Ralstonite3.CF.05
    NaMgAl(F,OH)
     
    6
    		·H
     
    2
    		O
  		• Sellaite3.AB.15
    MgF
     
    2
  		• Thomsenolite3.CB.40
    NaCaAlF
     
    6
    		·H
     
    2
    		O
    Group 4 - Oxides and Hydroxides
  		• Anatase4.DD.05
    TiO
     
    2
  		• Birnessite ?4.FL.45
    (Na,Ca)
     
    0.5
    		(Mn
    4+
     
    		,Mn
    3+
     
    		)
     
    2
    		O
     
    4
    		 · 1.5H
     
    2
    		O
  		• Brookite4.DD.10
    TiO
     
    2
  		• Cerianite-(Ce) ?4.DL.05
    (Ce
    4+
     
    		,Th)O
     
    2
  		• Ceriopyrochlore-(Ce)4.DH.15
    (Ce,Ca,Y)
     
    2
    		(Nb,Ta)
     
    2
    		O
     
    6
    		(OH,F)
  		• Columbite-(Fe) ?4.DB.35
    FeNb
     
    2
    		O
     
    6
  		• Doyleite4.FE.10
    Al(OH)
     
    3
  		• Goethite4.FD.10
    α-Fe
    3+
     
    		O(OH)
  		• Hematite4.CB.05
    Fe
     
    2
    		O
     
    3
  		• Opal4.DA.10
    SiO
     
    2
    		·nH
     
    2
    		O
  		• Plumbopyrochlore4.DH.15
    (Pb,Ca,Y,U)
     
    2-x
    		(Nb,Ta,Ti)
     
    2
    		O
     
    6
    		(OH,O)
  		• Pyrochlore4.DH.15
    (Ca,Na)
     
    2
    		Nb
     
    2
    		O
     
    6
    		(OH,F)
  		• Pyrophanite4.CB.05
    Mn
    2+
     
    		TiO
     
    3
  		• Quartz4.DA.05
    SiO
     
    2
  		• Rutile4.DB.05
    TiO
     
    2
    Group 5 - Nitrates and Carbonates
  		• Bastnäsite-(Ce)5.BD.20a
    (Ce,La)[F|CO
     
    3
    		]
  		• Rhodochrosite5.AB.05
    MnCO
     
    3
    Group 7 - Sulphates, Chromates, Molybdates and Tungstates
  		• Wulfenite7.GA.05
    Pb[MoO
     
    4
    		]
    Group 8 - Phosphates, Arsenates and Vanadates
  		• Monazite-(Ce)8.AD.50
    (Ce,La,Nd,Th)PO
     
    4
    Group 9 - Silicates
  		• Aegirine9.DA.25
    NaFe
    3+
     
    		[Si
     
    2
    		O
     
    6
    		]
  		• Albite9.FA.35
    Na[AlSi
     
    3
    		O
     
    8
    		]
  		• Allophane9.ED.20
    (Al
     
    2
    		O
     
    3
    		)(SiO
     
    2
    		)
     
    1.3-2
    		·2.5-3H
     
    2
    		O
  		• Andradite9.AD.25
    Ca
     
    3
    		Fe
    3+
    2
    		[SiO
     
    4
    		]
     
    3
  		• Astrophyllite ?9.DC.05
    (K,Na)
     
    3
    		(Fe,Mn)
     
    7
    		Ti
     
    2
    		Si
     
    8
    		O
     
    24
    		(O,OH)
     
    7
  		• Clinochlore9.EC.55
    (Mg,Fe
    2+
     
    		)
     
    5
    		Al[(OH)
     
    8
    		|AlSi
     
    3
    		O
     
    10
    		]
  		• Dalyite9.EA.25
    K
     
    2
    		ZrSi
     
    6
    		O
     
    15
  		• Elpidite9.DG.65
    Na
     
    2
    		ZrSi
     
    6
    		O
     
    15
    		·3H
     
    2
    		O
  		• Epididymite9.DG.55
    Na
     
    2
    		Be
     
    2
    		Si
     
    6
    		O
     
    15
    		·H
     
    2
    		O
  		• Genthelvite9.FB.10
    Zn
     
    4
    		Be
     
    3
    		[S|(SiO
     
    4
    		)
     
    3
    		]
  		• Gjerdingenite-Fe (TL)9.CE.30c
    K
     
    2
    		Fe
    2+
     
    		(Nb,Ti)
     
    4
    		[(O,OH)
     
    2
    		|Si
     
    4
    		O
     
    12
    		]
     
    2
    		 · 6H
     
    2
    		O
  		• Gjerdingenite-Mn (TL)9.CE.30c
    K
     
    2
    		Mn
    2+
     
    		(Nb,Ti)
     
    4
    		[(O,OH)
     
    2
    		|Si
     
    4
    		O
     
    12
    		]
     
    2
    		 · 6H
     
    2
    		O
  		• Janhaugite (TL)9.BE.17
    (Na,Ca)
     
    3
    		(Mn,Fe)
     
    3
    		(Ti,Zr,Nb)
     
    2
    		Si
     
    4
    		O
     
    15
    		(OH,F,O)
     
    3
  		• Kaolinite9.ED.05
    Al
     
    2
    		Si
     
    2
    		O
     
    5
    		(OH)
     
    4
  		• Kupletskite9.DC.05
    (K,Na)
     
    3
    		(Mn,Fe)
     
    7
    		Ti
     
    2
    		Si
     
    8
    		O
     
    26
    		(OH)
     
    4
    		F
  		• Lorenzenite9.DB.10
    Na
     
    2
    		Ti
     
    2
    		[O
     
    3
    		|Si
     
    2
    		O
     
    6
    		]
  		• Microcline9.FA.30
    K[AlSi
     
    3
    		O
     
    8
    		]
  		• Montmorillonite9.EC.40
    (Na,Ca)
     
    0.33
    		(Al,Mg)
     
    2
    		Si
     
    4
    		O
     
    10
    		(OH)
     
    2
    		·nH
     
    2
    		O
  		• Muscovite9.EC.15
    KAl
     
    2
    		[(OH)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
  		• Narsarsukite9.DJ.05
    Na
     
    2
    		(Ti,Fe)Si
     
    4
    		(O,F)
     
    11
  		• Orthoclase9.FA.30
    K[AlSi
     
    3
    		O
     
    8
    		]
  		• Phlogopite9.EC.20
    KMg
     
    3
    		[(OH,F)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
  		• Rhodonite9.DK.05
    MnSiO
     
    3
  		• Riebeckite9.DE.25
    [ ][Na
     
    2
    		][Fe
    2+
    3
    		Fe
    3+
    2
    		][(OH)
     
    2
    		|Si
     
    8
    		O
     
    22
    		]
  		• Stilpnomelane9.EG.40
    (K,Ca,Na)(Fe
    2+
     
    		,Mg,Al,Fe
    3+
     
    		)
     
    8
    		(Si,Al)
     
    12
    		(O,OH)
     
    36
    		 · nH
     
    2
    		O
  		• Zircon9.AD.30
    Zr[SiO
     
    4
    		]
    Unclassified Minerals
  		• 'Apatite' ?-
  		• Columbite-
    (Fe,Mn)(Nb,Ta)
     
    2
    		O
     
    6


    62 entries listed. 60 valid minerals. 1 erroneous literature entry.

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