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Dragehullet, Torsberg, Flakvarp, Skien, Telemark, Norwayi
Regional Level Types
Dragehullet- not defined -
Torsberg- not defined -
Flakvarp- not defined -
SkienMunicipality
TelemarkCounty
NorwayCountry

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Name(s) in local language(s):Dragehullet (Bakerovnen), Torsberg, Flakvarp, Skien kommune, Telemark fylke, Norge
Latitude & Longitude (WGS84): 59° 7' 24'' North , 9° 36' 3'' East
Latitude & Longitude (decimal): 59.12341,9.60099
GeoHash:G#: u4wb67p4z
Köppen climate type:Dfb : Warm-summer humid continental climate


"Dragehullet" (The Dragon's Hole) was first described as an old mine under Tråk, by J. Machesen in 1770. However, the cave is most probably a result of natural processes (wave erosion), some prospecting on pyrite might have been done. The cave is 10m wide, 8-10m high and 10m deep.

Regions containing this locality

Eurasia Plate

Plate - 7,321 mineral species & varietal names listed

Scandinavia

Region - 2,040 mineral species & varietal names listed

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


8 valid minerals. 1 erroneous literature entry.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

'Chlorite Group'
Reference: Larsen, A.O. (1993): Gruver og skjerp i Skien. Stathelle 1993. 72p. (p. 60)
Epsomite
Formula: MgSO4 · 7H2O
Reference: Larsen, A.O.(1974): Sekundære mineraler fra Porsgrunn. NAGS-nytt 1(2),13+15
'Feldspar Group'
Reference: Larsen, A.O. (1993): Gruver og skjerp i Skien. Stathelle 1993. 72p. (p. 60)
'Gneiss'
Reference: Dahlgren, S. (1974) Hva er Dragehullet? NAGS-nytt: 1(4): 6-8.
Gypsum
Formula: CaSO4 · 2H2O
Reference: Larsen, A.O.(1974): Sekundære mineraler fra Porsgrunn. NAGS-nytt 1(2),13+15
Halotrichite
Formula: FeAl2(SO4)4 · 22H2O
Reference: Larsen, A.O. (1993): Gruver og skjerp i Skien. Stathelle 1993. 72p. (p. 60).
Hexahydrite
Formula: MgSO4 · 6H2O
Description: Showed to be pentahydrite
Reference: Raade, G. Sæbø, P. Chr. (1990): Pentahydrite, MgS04*5H2O, from Dragehullert, Porsgrunn. Interne notater 1961-1990. Mineralogisk-Geologisk Museum, UiO, Oslo, p.149
Montmorillonite
Formula: (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Reference: Larsen, A.O. (1993): Gruver og skjerp i Skien. Stathelle 1993. 72p. (p. 60).
Natrojarosite
Formula: NaFe3(SO4)2(OH)6
Reference: Larsen, A.O.(1974): Sekundære mineraler fra Porsgrunn. NAGS-nytt 1(2),13+15
Pentahydrite
Formula: MgSO4 · 5H2O
Reference: Larsen, A.O. (1993): Gruver og skjerp i Skien. Stathelle 1993. 72p. (p. 60)., Raade, G. Sæbø, P. Chr. (1990): Pentahydrite, MgS04*5H2O, from Dragehullert, Porsgrunn. Interne notater 1961-1990. Mineralogisk-Geologisk Museum, UiO, Oslo,p.149
Pyrite
Formula: FeS2
Reference: Larsen, A.O. (1993): Gruver og skjerp i Skien. Stathelle 1993. 72p. (p. 60).
Quartz
Formula: SiO2
Reference: Larsen, A.O. (1993): Gruver og skjerp i Skien. Stathelle 1993. 72p. (p. 60).

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
'Pyrite'2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
'Quartz'4.DA.05SiO2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
'Epsomite'7.CB.40MgSO4 · 7H2O
'Gypsum'7.CD.40CaSO4 · 2H2O
'Halotrichite'7.CB.85FeAl2(SO4)4 · 22H2O
'Hexahydrite' ?7.CB.25MgSO4 · 6H2O
'Natrojarosite'7.BC.10NaFe3(SO4)2(OH)6
'Pentahydrite'7.CB.20MgSO4 · 5H2O
Group 9 - Silicates
'Montmorillonite'9.EC.40(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-
'Feldspar Group'-
'Gneiss'-

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 29 - HYDRATED ACID AND NORMAL SULFATES
AXO4·xH2O
Epsomite29.6.11.1MgSO4 · 7H2O
Gypsum29.6.3.1CaSO4 · 2H2O
Hexahydrite ?29.6.8.1MgSO4 · 6H2O
Pentahydrite29.6.7.3MgSO4 · 5H2O
AB2(XO4)4·H2O
Halotrichite29.7.3.2FeAl2(SO4)4 · 22H2O
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 clays
Montmorillonite71.3.1a.2(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-
'Feldspar Group'-
'Gneiss'-
Natrojarosite-NaFe3(SO4)2(OH)6

List of minerals for each chemical element

HHydrogen
H EpsomiteMgSO4 · 7H2O
H GypsumCaSO4 · 2H2O
H HalotrichiteFeAl2(SO4)4 · 22H2O
H HexahydriteMgSO4 · 6H2O
H Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
H NatrojarositeNaFe3(SO4)2(OH)6
H PentahydriteMgSO4 · 5H2O
OOxygen
O EpsomiteMgSO4 · 7H2O
O GypsumCaSO4 · 2H2O
O HalotrichiteFeAl2(SO4)4 · 22H2O
O HexahydriteMgSO4 · 6H2O
O Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
O NatrojarositeNaFe3(SO4)2(OH)6
O PentahydriteMgSO4 · 5H2O
O QuartzSiO2
NaSodium
Na Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Na NatrojarositeNaFe3(SO4)2(OH)6
MgMagnesium
Mg EpsomiteMgSO4 · 7H2O
Mg HexahydriteMgSO4 · 6H2O
Mg Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Mg PentahydriteMgSO4 · 5H2O
AlAluminium
Al HalotrichiteFeAl2(SO4)4 · 22H2O
Al Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
SiSilicon
Si Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Si QuartzSiO2
SSulfur
S EpsomiteMgSO4 · 7H2O
S GypsumCaSO4 · 2H2O
S HalotrichiteFeAl2(SO4)4 · 22H2O
S HexahydriteMgSO4 · 6H2O
S NatrojarositeNaFe3(SO4)2(OH)6
S PentahydriteMgSO4 · 5H2O
S PyriteFeS2
CaCalcium
Ca GypsumCaSO4 · 2H2O
Ca Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
FeIron
Fe HalotrichiteFeAl2(SO4)4 · 22H2O
Fe NatrojarositeNaFe3(SO4)2(OH)6
Fe PyriteFeS2

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Proterozoic
541 - 2500 Ma



ID: 3186372
Proterozoic crystalline metamorphic rocks

Age: Proterozoic (541 - 2500 Ma)

Lithology: Granitoid gneiss; orthogneiss/paragneiss

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Mesoproterozoic
1000 - 1600 Ma



ID: 3151395
Proterozoic II granite

Age: Mesoproterozoic (1000 - 1600 Ma)

Lithology: Major:{granite}, Minor{monzonite,meta-granite,meta-monzonite}

Reference: Asch, K. The 1:5M International Geological Map of Europe and Adjacent Areas: Development and Implementation of a GIS-enabled Concept. Geologisches Jahrbuch, SA 3. [147]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Dahlgren, S. (1974) Hva er Dragehullet? NAGS-nytt: 1(4): 6-8.
Larsen, A.O. (1974) Sekundære mineraler fra Porsgrunn. NAGS-nytt 1(2): 13+15.
Raade, G. and Sæbø, P.C. (1990) Pentahydrite, MgS04*5H2O, from Dragehullet, Porsgrunn. Interne notater 1961-1990. Mineralogisk-Geologisk Museum, UiO, Oslo, p. 149.
Larsen, A.O. (1993) Gruver og skjerp i Skien. Stathelle 1993. 72p. (pp. 60-61).

External Links



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