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Dalen-Kjørholt Mine, Brevik, Porsgrunn, Telemark, Norway i
Regional Level Types
Dalen-Kjørholt Mine Mine
Brevik Town
Porsgrunn Municipality
Telemark County
Norway Country

Regional Level Types
Dalen-Kjørholt Mine	Mine
Brevik	Town
Porsgrunn	Municipality
Telemark	County
Norway	Country

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Inside a huge crystal cave

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

Inside a huge crystal cave

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

Inside a huge crystal cave

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

Inside a huge crystal cave

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

Inside a huge crystal cave

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

Inside a huge crystal cave

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

Inside a huge crystal cave

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

Inside a huge crystal cave

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

Latitude & Longitude (WGS84):

59° 3' 48'' North , 9° 41' 2'' East

Latitude & Longitude (decimal):

Type:

Köppen climate type:

Dfb : Warm-summer humid continental climate

Nearest Settlements:

Place	Population	Distance
Langangen	505 (2014)	7.4km
Herre	1,356 (2013)	8.3km
Porsgrunn	34,377 (2017)	8.7km
Skien	50,595 (2016)	16.8km
Larvik	23,113 (2018)	20.1km

Nearest Clubs:
Local clubs are the best way to get access to collecting localities

Club	Location	Distance
Fensfeltet Geologiforening	Ulefoss	32km

Mindat Locality ID:

13899

Long-form identifier:

mindat:1:2:13899:9

GUID (UUID V4):

Other/historical names associated with this locality:

Dalen Portland; Norcem Brevik; Kjørholt gruve

Other Languages:

Norwegian:

Dalen-Kjørholt gruve, Brevik, Porsgrunn, Telemark, Norge

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.(2024: transfered to the Natural History Museum in Oslo).

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.

ⓘ Limestone

Mineral List

12 valid minerals.

Rock Types Recorded

Select Rock List Type

Alphabetical List Tree Diagram

ⓘ Limestone

Detailed Mineral List:

ⓘ Analcime

Formula: Na(AlSi₂O₆) · H₂O

References:

Nordrum, Fred Steinar (1993) De siste års mineralfunn i Dalen-Kjørholt gruve, in Telemark I. STEIN. Nordisk magasin for populær geologi, 20 (2) 100-110

ⓘ 'Apophyllite Group'

Formula: AB₄[Si₈O₂₀]X · 8H₂O

References:

Nordrum, Fred Steinar (1993) De siste års mineralfunn i Dalen-Kjørholt gruve, in Telemark I. STEIN. Nordisk magasin for populær geologi, 20 (2) 100-110

ⓘ Baryte

Formula: BaSO₄

References:

Nordrum, Fred Steinar (1993) De siste års mineralfunn i Dalen-Kjørholt gruve, in Telemark I. STEIN. Nordisk magasin for populær geologi, 20 (2) 100-110

✪ Calcite

Formula: CaCO₃

References:

Nordrum, Fred Steinar (1993) De siste års mineralfunn i Dalen-Kjørholt gruve, in Telemark I. STEIN. Nordisk magasin for populær geologi, 20 (2) 100-110

Nordrum, Fred Steinar (2001) Neue Mineralienfunde aus Norwegen [New mineral discoveries from Norway]. Mineralien-Welt, 12 (5). 62-64

ⓘ 'Chlorite Group'

References:

Nordrum, Fred Steinar (1993) De siste års mineralfunn i Dalen-Kjørholt gruve, in Telemark I. STEIN. Nordisk magasin for populær geologi, 20 (2) 100-110

ⓘ Fluorapophyllite-(K)

Formula: KCa₄(Si₈O₂₀)(F,OH) · 8H₂O

References:

Nordrum, Fred Steinar (2000) Nyfunn av mineraler i Norge 1999-2000. Norsk Bergverksmuseum Skrift, 17. 59-63

ⓘ Fluorite

Formula: CaF₂

References:

Nordrum, Fred Steinar (1993) De siste års mineralfunn i Dalen-Kjørholt gruve, in Telemark I. STEIN. Nordisk magasin for populær geologi, 20 (2) 100-110

ⓘ Laumontite

Formula: CaAl₂Si₄O₁₂ · 4H₂O

References:

Nordrum, Fred Steinar (1993) De siste års mineralfunn i Dalen-Kjørholt gruve, in Telemark I. STEIN. Nordisk magasin for populær geologi, 20 (2) 100-110

ⓘ Manganite

Formula: Mn³⁺O(OH)

Description: Identified at the x-ray laboratory of Mineralogical Museum of Oslo, 1976.

References:

Neumann, Henrich (1985) Norges Mineraler [The Minerals of Norway]. Norges geologiske Undersøkelse Skrifter Vol. 68. Universitetsforlaget

ⓘ Marcasite

Formula: FeS₂

References:

Nordrum, Fred Steinar (1993) De siste års mineralfunn i Dalen-Kjørholt gruve, in Telemark I. STEIN. Nordisk magasin for populær geologi, 20 (2) 100-110

ⓘ Palygorskite

Formula: ◻Al₂Mg₂◻₂Si₈O₂₀(OH)₂(H₂O)₄ · 4H₂O

References:

Nordrum, Fred Steinar (1993) De siste års mineralfunn i Dalen-Kjørholt gruve, in Telemark I. STEIN. Nordisk magasin for populær geologi, 20 (2) 100-110

ⓘ Pyrite

Formula: FeS₂

References:

Nordrum, Fred Steinar (1993) De siste års mineralfunn i Dalen-Kjørholt gruve, in Telemark I. STEIN. Nordisk magasin for populær geologi, 20 (2) 100-110

ⓘ Pyrrhotite

Formula: Fe_1-xS

References:

Nordrum, Fred Steinar (1993) De siste års mineralfunn i Dalen-Kjørholt gruve, in Telemark I. STEIN. Nordisk magasin for populær geologi, 20 (2) 100-110

ⓘ Quartz

Formula: SiO₂

References:

Nordrum, Fred Steinar (1993) De siste års mineralfunn i Dalen-Kjørholt gruve, in Telemark I. STEIN. Nordisk magasin for populær geologi, 20 (2) 100-110

ⓘ Quartz var. Chalcedony

Formula: SiO₂

References:

Nordrum, Fred Steinar (1993) De siste års mineralfunn i Dalen-Kjørholt gruve, in Telemark I. STEIN. Nordisk magasin for populær geologi, 20 (2) 100-110

ⓘ 'Stilbite Subgroup'

Formula: M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O

References:

Nordrum, Fred Steinar (1993) De siste års mineralfunn i Dalen-Kjørholt gruve, in Telemark I. STEIN. Nordisk magasin for populær geologi, 20 (2) 100-110

Gallery:

M_6-7[Al_8-9Si_27-28O₇₂] · nH₂Oⓘ 'Stilbite Subgroup'

Stilbite Subgroup

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

Stilbite Subgroup

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

Stilbite Subgroup

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

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘ	Pyrrhotite	2.CC.10	Fe_1-xS
ⓘ	Pyrite	2.EB.05a	FeS₂
ⓘ	Marcasite	2.EB.10a	FeS₂
Group 3 - Halides
ⓘ	Fluorite	3.AB.25	CaF₂
Group 4 - Oxides and Hydroxides
ⓘ	Quartz var. Chalcedony	4.DA.05	SiO₂
ⓘ		4.DA.05	SiO₂
ⓘ	Manganite	4.FD.15	Mn³⁺O(OH)
Group 5 - Nitrates and Carbonates
ⓘ	Calcite	5.AB.05	CaCO₃
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘ	Baryte	7.AD.35	BaSO₄
Group 9 - Silicates
ⓘ	Fluorapophyllite-(K)	9.EA.15	KCa₄(Si₈O₂₀)(F,OH) · 8H₂O
ⓘ	Palygorskite	9.EE.20	◻Al₂Mg₂◻₂Si₈O₂₀(OH)₂(H₂O)₄ · 4H₂O
ⓘ	Analcime	9.GB.05	Na(AlSi₂O₆) · H₂O
ⓘ	Laumontite	9.GB.10	CaAl₂Si₄O₁₂ · 4H₂O
Unclassified
ⓘ	'Apophyllite Group'	-	AB₄[Si₈O₂₀]X · 8H₂O
ⓘ	'Chlorite Group'	-
ⓘ	'Stilbite Subgroup'	-	M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
H	ⓘ Apophyllite Group	AB₄[Si₈O₂₀]X · 8H₂O
H	ⓘ Fluorapophyllite-(K)	KCa₄(Si₈O₂₀)(F,OH) · 8H₂O
H	ⓘ Laumontite	CaAl₂Si₄O₁₂ · 4H₂O
H	ⓘ Manganite	Mn³⁺O(OH)
H	ⓘ Palygorskite	◻Al₂Mg₂◻₂Si₈O₂₀(OH)₂(H₂O)₄ · 4H₂O
H	ⓘ Stilbite Subgroup	M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O
C	Carbon
C	ⓘ Calcite	CaCO₃
O	Oxygen
O	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
O	ⓘ Apophyllite Group	AB₄[Si₈O₂₀]X · 8H₂O
O	ⓘ Baryte	BaSO₄
O	ⓘ Calcite	CaCO₃
O	ⓘ Quartz var. Chalcedony	SiO₂
O	ⓘ Fluorapophyllite-(K)	KCa₄(Si₈O₂₀)(F,OH) · 8H₂O
O	ⓘ Laumontite	CaAl₂Si₄O₁₂ · 4H₂O
O	ⓘ Manganite	Mn³⁺O(OH)
O	ⓘ Palygorskite	◻Al₂Mg₂◻₂Si₈O₂₀(OH)₂(H₂O)₄ · 4H₂O
O	ⓘ Quartz	SiO₂
O	ⓘ Stilbite Subgroup	M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O
F	Fluorine
F	ⓘ Fluorapophyllite-(K)	KCa₄(Si₈O₂₀)(F,OH) · 8H₂O
F	ⓘ Fluorite	CaF₂
Na	Sodium
Na	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
Mg	Magnesium
Mg	ⓘ Palygorskite	◻Al₂Mg₂◻₂Si₈O₂₀(OH)₂(H₂O)₄ · 4H₂O
Al	Aluminium
Al	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
Al	ⓘ Laumontite	CaAl₂Si₄O₁₂ · 4H₂O
Al	ⓘ Palygorskite	◻Al₂Mg₂◻₂Si₈O₂₀(OH)₂(H₂O)₄ · 4H₂O
Al	ⓘ Stilbite Subgroup	M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O
Si	Silicon
Si	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
Si	ⓘ Apophyllite Group	AB₄[Si₈O₂₀]X · 8H₂O
Si	ⓘ Quartz var. Chalcedony	SiO₂
Si	ⓘ Fluorapophyllite-(K)	KCa₄(Si₈O₂₀)(F,OH) · 8H₂O
Si	ⓘ Laumontite	CaAl₂Si₄O₁₂ · 4H₂O
Si	ⓘ Palygorskite	◻Al₂Mg₂◻₂Si₈O₂₀(OH)₂(H₂O)₄ · 4H₂O
Si	ⓘ Quartz	SiO₂
Si	ⓘ Stilbite Subgroup	M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O
S	Sulfur
S	ⓘ Baryte	BaSO₄
S	ⓘ Marcasite	FeS₂
S	ⓘ Pyrite	FeS₂
S	ⓘ Pyrrhotite	Fe_1-xS
K	Potassium
K	ⓘ Fluorapophyllite-(K)	KCa₄(Si₈O₂₀)(F,OH) · 8H₂O
Ca	Calcium
Ca	ⓘ Calcite	CaCO₃
Ca	ⓘ Fluorapophyllite-(K)	KCa₄(Si₈O₂₀)(F,OH) · 8H₂O
Ca	ⓘ Fluorite	CaF₂
Ca	ⓘ Laumontite	CaAl₂Si₄O₁₂ · 4H₂O
Mn	Manganese
Mn	ⓘ Manganite	Mn³⁺O(OH)
Fe	Iron
Fe	ⓘ Marcasite	FeS₂
Fe	ⓘ Pyrite	FeS₂
Fe	ⓘ Pyrrhotite	Fe_1-xS
Ba	Barium
Ba	ⓘ Baryte	BaSO₄

Other Databases

Link to Geological Survey of Norway:	8476

Other Regions, Features and Areas containing this locality

Eurasian PlateTectonic Plate

Baltic Shield
- Sveconorwegian BeltShield

EuropeContinent

Norway

⭔Vestfold og Telemark (2020-2023)County

ScandinaviaRegion

This page 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. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Wiik, Geir H. (1992): Dalen-Portland. STEIN 19 (29), 109-117

King, Vandall T., Robinson, George W. (1993) What's New in Minerals? - Annual World Summary of Mineral Discoveries, April 1992 through April 1993. The Mineralogical Record, 24 (5) 381-394

Nordrum, Fred Steinar (1993) Dalen-Kjørholt gruve, in Telemark I. STEIN. Nordisk magasin for populær geologi, 20 (2) 98-99

Nordrum, Fred Steinar (1993) De siste års mineralfunn i Dalen-Kjørholt gruve, in Telemark I. STEIN. Nordisk magasin for populær geologi, 20 (2) 100-110

Nordrum, Fred Steinar (1993) Die Dalen-Kjørholt Kalksteingrube in Süd-Norwegen, ein neuer Fundort für exzellente Calcitsufen [The Dalen-Kjørholt limestone quarry in southern Norway, a new locality for excellent calcite specimens]. Mineralien Welt, 4 (5). 49-56

Garmo, Torgeir T. (1996) Über die neuen Mineralfunde 1995 in Norwegen [About the new mineral discoveries in Norway in 1995]. Mineralien-Welt, 7 (3). 25-27

Nordrum, Fred Steinar (2000) Nyfunn av mineraler i Norge 1999-2000. Norsk Bergverksmuseum Skrift, 17. 59-63

Nordrum, Fred Steinar (2001) Noen funn av mineraler i Norge 2000-2001, del 1. STEIN. Nordisk magasin for populær geologi, 28 (2) 13-19

Nordrum, Fred Steinar (2001) Neue Mineralienfunde aus Norwegen [New mineral discoveries from Norway]. Mineralien-Welt, 12 (5). 62-64

Nordrum, Fred Steinar (2002) Nyfunn av mineraler i Norge 2001-2002. STEIN. Nordisk magasin for populær geologi, 29 (2) 4-10

Nordrum, Fred Steinar (2002) Mineralogische Neuigkeiten aus Norwegen [Mineralogical news from Norway]. Mineralien-Welt, 13 (5). 56-59

Nordrum, Fred Steinar (2004) Nyfunn av mineraler i Norge 2003-2004. STEIN. Nordisk magasin for populær geologi, 31 (2) 36-44

Nordrum, Fred Steinar (2005) Nyfunn av mineraler i Norge 2004-2005 [New finds of minerals in Norway 2004-2005]. Norsk Bergverksmuseum Skrift, 30. 117-124

Nordrum, Fred Steinar (2007) Nyfunn av mineraler i Norge 2006-2007. STEIN. Nordisk magasin for populær geologi, 34 (2) 14-26

Nordrum, Fred Steinar (2008) Nyfunn av mineraler i Norge 2007-2008. STEIN. Magasin for populærgeologi, 35 (2) 8-20

Nordrum, Fred Steinar (2008) Dalen- Kjørholt kalksteinsgruve store drusefunn 2007-2008. STEIN. Magasin for populærgeologi, 35 (3) 8-15

Nordrum, Fred Steinar (2008) Neuer Calcit-Fund aus Dalen-Kjørholt/Norwegen [New calcite find from Dalen-Kjørholt/Norway]. Mineralien-Welt, 19 (2). 32-33

Nordrum, Fred Steinar (2011) Noen nyfunn av mineraler i Norge 2010-2011. STEIN. Magasin for populærgeologi, 38 (2) 14-23

Nordrum, Fred Steinar (2012) Noen funn av mineraler i Norge 2011-2012 [Some finds of minerals in Norway 2011-2012]. Norsk Bergverksmuseum Skrift, 49. 117-124

www.nags.net (2016) http://www.nags.net/stein/1993/Dalen-Kjorholt.pdf

www.nags.net (2020) http://www.nags.net/stein/1993/Dalen-Kjorholt-mineraler.pdf

www.nags.net (2020) http://www.nags.net/stein/2008/Nordrum-%20Dalen-Kjorholt.pdf

Kjærnet, Torfinn (2023) Markasitt- og pyrittheliktitter fra Dalen Kjørholt gruve, Brevik, Telemark [Helictites of marcasite and pyrite from Dalen Kjørholt mine, Brevik, Telemark]. Norsk Mineralsymposium 2023, Stathelle. 39-47

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Dalen-Kjørholt Mine, Brevik, Porsgrunn, Telemark, NorwayiRegional Level TypesDalen-Kjørholt MineMine BrevikTown PorsgrunnMunicipality TelemarkCounty NorwayCountry function showexplain() { $("#locexplain").toggle(); if (typeof movemap === "function") movemap(); }

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Commodity List

Mineral List

Rock Types Recorded

Select Rock List Type

Detailed Mineral List:

Gallery:

List of minerals arranged by Strunz 10th Edition classification

List of minerals for each chemical element

Other Databases

Other Regions, Features and Areas containing this locality

References

Dalen-Kjørholt Mine, Brevik, Porsgrunn, Telemark, Norway i
Regional Level Types
Dalen-Kjørholt Mine Mine
Brevik Town
Porsgrunn Municipality
Telemark County
Norway Country