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Dalen-Kjørholt Mine, Kjørholt, Brevik, Porsgrunn, Telemark, Norway

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Huge underground limestone mine famous for excellent calcite crystals with an astonishing variety of habits (including various types of twin laws). The calcite crystals occur in voids (crystal caves) that can reach up to about 40 m in length and that can be walked or crawled through.

Previously there were two mines, the Dalen mine and the closely neighbouring Kjørholt mine; the latter was later bought by the first one. The mine presently (2009) has reached a depth of about 300 m.

An excellent selection of minerals from this mine is exhibited at the Norsk Bergverksmuseum in Kongsberg.



References:
- Wiik, Geir H. (1992): Dalen-Portland. STEIN 19 (29), 109-117
- Robinson, G. W. & King, V. T. (1993): What’s New in Minerals ? Annual world summary of mineral discoveries covering april 1992 through april 1993. Mineralogical Record 24: 393
- Nordrum, Fred Steinar (1993): Dalen-Kjørholt gruve. STEIN 20 (2), 98-99
- Nordrum, Fred Steinar (1993): De siste års mineralfunn i Dalen- Kjørholt gruve. STEIN 20 (2), 100-111
- Nordrum, F.S. (1993): Die Dalen-Kjörholt-Kalksteingrube in Süd-Norwegen, ein neuer Fundort für exzellente Calcitstufen. Mineralien-Welt, 4 (5), 49-56.
- Garmo, T. (1995): Über die neuen Mineralfunde 1995 in Norwegen. Mineralien-Welt 6 (3), 25-27
- Nordrum, F.S. (2000). Nyfunn av mineraler i Norge 1999-2000. Bergverksmuseets Skrift 17:59-63
- Nordrum, F.S. (2001): Noen funn av mineraler i Norge 2000-2001. STEIN 28 (2): 13- 19
- Nordrum, F.S. (2001): Neue Mineralienfunde aus Norwegen. Mineralien-Welt, 12 (5), 62-64
- Nordrum, F.S. (2002): Nyfunn av mineraler i Norge 2001-2002. STEIN 29 (2): 4-10
- Nordrum, F.S. (2002): Mineralogische Neuigkeiten aus Norwegen. Mineralien-Welt, 13 (5), 56-59.
- Nordrum, F. S. (2004): Nyfunn av mineraler i Norge 2003-2004. STEIN 31 (2), 36-44
- Nordrum, F. S. (2007): Nyfunn av mineraler i Norge 2006-2007. STEIN 34 (2), 14-26
- Nordrum, F.S. (2008a): Nyfunn av mineraler i Norge 2007-2008. STEIN 35 (2), 8-20 [on the find of "amber calcite"]
- Nordum, F.S. (2008b): Dalen-Kjørholt kalksteinsgruve store drusefunn 2007-2008. STEIN 35 (3), 8-15
- Nordrum, F.S. (2008): Neuer Calcit-Fund aus Dalen-Kjörholt/ Norwegen. Mineralien-Welt, 19 (2), 32-33.






Mineral List:
  		•  Albite
    Na[AlSi
     
    3
    		O
     
    8
    		]
    Reference: []
  		•  Analcime
    Na
     
    2
    		[Al
     
    2
    		Si
     
    4
    		O
     
    12
    		] · 2H
     
    2
    		O
    Reference: [Nordrum, Fred Steinar (1993): De siste års mineralfunn i Dalen- Kjørholt gruve. STEIN 20 (2), 100-111]
  		•  'Apophyllite'
    Reference: [Nordrum, Fred Steinar (1993): De siste års mineralfunn i Dalen- Kjørholt gruve. STEIN 20 (2), 100-111]
    Site Photo
    Dalen-Kjørholt Mine, Kjørholt, Brevik, Porsgrunn, Telemark, Norway
    © Bill Morgenstern
  		•  Apophyllite-(KF)
    KCa
     
    4
    		[(F,OH)|Si
     
    8
    		O
     
    20
    		] · 8H
     
    2
    		O
    Reference: [- Nordrum, F.S. (2000). Nyfunn av mineraler i Norge 1999-2000. Bergverksmuseets Skrift 17:59-63 ]
  		•  Baryte
    BaSO
     
    4
    Reference: [Nordrum, Fred Steinar (1993): De siste års mineralfunn i Dalen- Kjørholt gruve. STEIN 20 (2), 100-111]
  		•  Calcite
    CaCO
     
    3
    Reference: [Nordrum, Fred Steinar (1993): De siste års mineralfunn i Dalen- Kjørholt gruve. STEIN 20 (2), 100-111]
    Site Photo
    Dalen-Kjørholt Mine, Kjørholt, Brevik, Porsgrunn, Telemark, Norway
    © Bill Morgenstern
  		•  'Chalcedony'
    Reference: [Nordrum, Fred Steinar (1993): De siste års mineralfunn i Dalen- Kjørholt gruve. STEIN 20 (2), 100-111]
  		•  'Chlorite Group'
    Reference: [Nordrum, Fred Steinar (1993): De siste års mineralfunn i Dalen- Kjørholt gruve. STEIN 20 (2), 100-111]
  		•  Fluorite
    CaF
     
    2
    Reference: [Nordrum, Fred Steinar (1993): De siste års mineralfunn i Dalen- Kjørholt gruve. STEIN 20 (2), 100-111]
    Site Photo
    Dalen-Kjørholt Mine, Kjørholt, Brevik, Porsgrunn, Telemark, Norway
    © Bill Morgenstern
  		•  Laumontite
    CaAl
     
    2
    		Si
     
    4
    		O
     
    12
    		·4H
     
    2
    		O
    Reference: [Nordrum, Fred Steinar (1993): De siste års mineralfunn i Dalen- Kjørholt gruve. STEIN 20 (2), 100-111]
  		•  Manganite
    Mn
    3+
     
    		O(OH)
    Description: Identifyed at the x-ray laboratory of Mineralogical Museum of Oslo, 1976.
    Reference: [Neumann (1985, p. 89).]
  		•  Marcasite
    FeS
     
    2
    Reference: [Nordrum, Fred Steinar (1993): De siste års mineralfunn i Dalen- Kjørholt gruve. STEIN 20 (2), 100-111]
    Site Photo
    Dalen-Kjørholt Mine, Kjørholt, Brevik, Porsgrunn, Telemark, Norway
    © Bill Morgenstern
  		•  Natrolite
    Na
     
    2
    		[Al
     
    2
    		Si
     
    3
    		O
     
    10
    		] · 2H
     
    2
    		O
    Reference: []
  		•  Palygorskite
    (Mg,Al)
     
    5
    		(Si,Al)
     
    8
    		O
     
    20
    		(OH)
     
    2
    		·8H
     
    2
    		O
    Reference: [Nordrum, Fred Steinar (1993): De siste års mineralfunn i Dalen- Kjørholt gruve. STEIN 20 (2), 100-111]
  		•  Prehnite
    Ca
     
    2
    		Al
     
    2
    		Si
     
    3
    		O
     
    12
    		(OH)
    Reference: []
  		•  Pyrite
    FeS
     
    2
    Reference: [Nordrum, Fred Steinar (1993): De siste års mineralfunn i Dalen- Kjørholt gruve. STEIN 20 (2), 100-111]
    Site Photo
    Dalen-Kjørholt Mine, Kjørholt, Brevik, Porsgrunn, Telemark, Norway
    © Bill Morgenstern
  		•  Pyrrhotite
    Fe
     
    7
    		S
     
    8
    		, (-4M), also given as Fe
     
    1-x
    		S (x = 0 - 0.2)
    Reference: [Nordrum, Fred Steinar (1993): De siste års mineralfunn i Dalen- Kjørholt gruve. STEIN 20 (2), 100-111]
  		•  Quartz
    SiO
     
    2
    Reference: [Nordrum, Fred Steinar (1993): De siste års mineralfunn i Dalen- Kjørholt gruve. STEIN 20 (2), 100-111]
    Site Photo
    Dalen-Kjørholt Mine, Kjørholt, Brevik, Porsgrunn, Telemark, Norway
    © Bill Morgenstern
  		•  'Stilbite'
    Reference: [Nordrum, Fred Steinar (1993): De siste års mineralfunn i Dalen- Kjørholt gruve. STEIN 20 (2), 100-111]


    19 entries listed. 15 valid minerals.

    The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database!
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