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Overntjern Quarry, Overntjern, Modum, Buskerud, Norwayi
Regional Level Types
Overntjern QuarryQuarry
OverntjernLake
ModumMunicipality
BuskerudCounty
NorwayCountry

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Latitude & Longitude (WGS84):
59° 57' 2'' North , 9° 51' 58'' East
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Vikersund2,448 (2016)7.2km
Nakkerud350 (2013)15.1km
Prestfoss465 (2014)16.5km
Tyristrand795 (2013)19.7km
Krøderen496 (2013)19.9km
Other Languages:
Norwegian:
Overngruve (Overntjern), Overntjern, Modum, Buskerud, Norge


A serpentine-magnesite deposit quarried for magnesite and serpentine.
Now abandoned.

The name Overntjern is often used for the quarry (Overngruve), although Overntjern is, in fact, a small, unmined serpentinite outcrop nearby (close to the track leading to the Overngruve).

Regions containing this locality

Eurasian PlateTectonic Plate
EuropeContinent
Fennoscandian ShieldShield
ScandinaviaRegion

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


11 valid minerals.

Detailed Mineral List:

Althausite
Formula: Mg4(PO4)2(OH,O)(F,☐)
Reference: Raade, G. & Tyssedal, M. (1975): Althausite, a new mineral from Modum, Norway. LITHOS 8, 215-219; Rømming, C. & Raade, G.(1980): The crystal structure of Althausite. American Mineralogist, 65, 488-498
'Apatite'
Formula: Ca5(PO4)3(Cl/F/OH)
Colour: brown
Reference: Rømming, C. & Raade, G.(1980): The crystal structure of Althausite. American Mineralogist, 65, 488-498
Brucite
Formula: Mg(OH)2
Reference: Nordrum, F.S. (2006): Nyfunn av mineraler i Norge 2005-2006. Norsk Bergverksmuseum Skrift. 33: 56-62
Clinochlore
Formula: Mg5Al(AlSi3O10)(OH)8
Reference: Knut Edvard Larsen collection
Clinochlore var: Leuchtenbergite
Formula: Mg5Al(AlSi3O10)(OH)8
Reference: Knut Edvard Larsen collection
Collinsite
Formula: Ca2Mg(PO4)2 · 2H2O
Description: As replacement of reddish althausite.
Reference: Chopin, C., Ferraris,G..Prencipe, M., Brunet, F. and Medenbach, O. (2001): Raadeite, Mg7(PO4)2(OH)8: a new dense-packed phosphate from Modum (Norway). European Journal of Mineralogy. 13: 319-327.
Dolomite
Formula: CaMg(CO3)2
Reference: Witsø, T. (1994): Sjelden dolomitt fra Overntjern. STEIN 21 (3), 193
Enstatite
Formula: MgSiO3
Reference: Rømming, C. & Raade, G.(1980): The crystal structure of Althausite. American Mineralogist, 65, 488-498
Hematite
Formula: Fe2O3
Reference: Uwe Kolitsch (SXRD-analysis)
Magnesite
Formula: MgCO3
Habit: massive cleavages
Colour: white, pale pink
Reference: Jøsang, Ottar (1966): Geologiske og petrologiske undersøkelser i Modumfeltet. Norges Geologiske Undersøkelse nr 235, 91-97
Phosphoellenbergerite
Formula: (Mg,◻)2Mg12(PO4,PO3OH)6(PO3OH,CO3)2(OH)6
Reference: Knut Eldjarn; Nordrum, F.S. (2000). Nyfunn av mineraler i Norge 1999-2000. Bergverksmuseets Skrift 17:59-63
Pyrope
Formula: Mg3Al2(SiO4)3
Reference: Nordrum, F.S. (2006): Nyfunn av mineraler i Norge 2005-2006. Norsk Bergverksmuseum Skrift. 33: 56-62
'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Reference: Jøsang, Ottar (1966): Geologiske og petrologiske undersøkelser i Modumfeltet. Norges Geologiske Undersøkelse nr 235, 91-97
Talc
Formula: Mg3Si4O10(OH)2
Reference: Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 4, 2000

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Brucite4.FE.05Mg(OH)2
Hematite4.CB.05Fe2O3
Group 5 - Nitrates and Carbonates
Dolomite5.AB.10CaMg(CO3)2
Magnesite5.AB.05MgCO3
Group 8 - Phosphates, Arsenates and Vanadates
Althausite8.BB.25Mg4(PO4)2(OH,O)(F,☐)
Collinsite8.CG.05Ca2Mg(PO4)2 · 2H2O
Phosphoellenbergerite8.BB.55(Mg,◻)2Mg12(PO4,PO3OH)6(PO3OH,CO3)2(OH)6
Group 9 - Silicates
Clinochlore9.EC.55Mg5Al(AlSi3O10)(OH)8
var: Leuchtenbergite9.EC.55Mg5Al(AlSi3O10)(OH)8
Enstatite9.DA.05MgSiO3
Pyrope9.AD.25Mg3Al2(SiO4)3
Talc9.EC.05Mg3Si4O10(OH)2
Unclassified Minerals, Rocks, etc.
'Apatite'-Ca5(PO4)3(Cl/F/OH)
'Serpentine Subgroup'-D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
X(OH)2
Brucite6.2.1.1Mg(OH)2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Magnesite14.1.1.2MgCO3
AB(XO3)2
Dolomite14.2.1.1CaMg(CO3)2
Group 40 - HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
AB2(XO4)2·xH2O
Collinsite40.2.2.3Ca2Mg(PO4)2 · 2H2O
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
A2(XO4)Zq
Althausite41.6.5.1Mg4(PO4)2(OH,O)(F,☐)
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Pyrope51.4.3a.1Mg3Al2(SiO4)3
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Enstatite65.1.2.1MgSiO3
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Talc71.2.1.3Mg3Si4O10(OH)2
Sheets of 6-membered rings interlayered 1:1, 2:1, and octahedra
Clinochlore71.4.1.4Mg5Al(AlSi3O10)(OH)8
Unclassified Minerals, Mixtures, etc.
'Apatite'-Ca5(PO4)3(Cl/F/OH)
Clinochlore
var: Leuchtenbergite
-Mg5Al(AlSi3O10)(OH)8
Phosphoellenbergerite-(Mg,◻)2Mg12(PO4,PO3OH)6(PO3OH,CO3)2(OH)6
'Serpentine Subgroup'-D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn

List of minerals for each chemical element

HHydrogen
H AlthausiteMg4(PO4)2(OH,O)(F,☐)
H ApatiteCa5(PO4)3(Cl/F/OH)
H Clinochlore (var: Leuchtenbergite)Mg5Al(AlSi3O10)(OH)8
H Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
H TalcMg3Si4O10(OH)2
H CollinsiteCa2Mg(PO4)2 · 2H2O
H Phosphoellenbergerite(Mg,◻)2Mg12(PO4,PO3OH)6(PO3OH,CO3)2(OH)6
H BruciteMg(OH)2
H ClinochloreMg5Al(AlSi3O10)(OH)8
CCarbon
C MagnesiteMgCO3
C Phosphoellenbergerite(Mg,◻)2Mg12(PO4,PO3OH)6(PO3OH,CO3)2(OH)6
C DolomiteCaMg(CO3)2
OOxygen
O AlthausiteMg4(PO4)2(OH,O)(F,☐)
O ApatiteCa5(PO4)3(Cl/F/OH)
O Clinochlore (var: Leuchtenbergite)Mg5Al(AlSi3O10)(OH)8
O Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
O EnstatiteMgSiO3
O TalcMg3Si4O10(OH)2
O MagnesiteMgCO3
O CollinsiteCa2Mg(PO4)2 · 2H2O
O Phosphoellenbergerite(Mg,◻)2Mg12(PO4,PO3OH)6(PO3OH,CO3)2(OH)6
O DolomiteCaMg(CO3)2
O HematiteFe2O3
O BruciteMg(OH)2
O PyropeMg3Al2(SiO4)3
O ClinochloreMg5Al(AlSi3O10)(OH)8
FFluorine
F AlthausiteMg4(PO4)2(OH,O)(F,☐)
F ApatiteCa5(PO4)3(Cl/F/OH)
MgMagnesium
Mg AlthausiteMg4(PO4)2(OH,O)(F,☐)
Mg Clinochlore (var: Leuchtenbergite)Mg5Al(AlSi3O10)(OH)8
Mg Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Mg EnstatiteMgSiO3
Mg TalcMg3Si4O10(OH)2
Mg MagnesiteMgCO3
Mg CollinsiteCa2Mg(PO4)2 · 2H2O
Mg Phosphoellenbergerite(Mg,◻)2Mg12(PO4,PO3OH)6(PO3OH,CO3)2(OH)6
Mg DolomiteCaMg(CO3)2
Mg BruciteMg(OH)2
Mg PyropeMg3Al2(SiO4)3
Mg ClinochloreMg5Al(AlSi3O10)(OH)8
AlAluminium
Al Clinochlore (var: Leuchtenbergite)Mg5Al(AlSi3O10)(OH)8
Al Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Al PyropeMg3Al2(SiO4)3
Al ClinochloreMg5Al(AlSi3O10)(OH)8
SiSilicon
Si Clinochlore (var: Leuchtenbergite)Mg5Al(AlSi3O10)(OH)8
Si Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Si EnstatiteMgSiO3
Si TalcMg3Si4O10(OH)2
Si PyropeMg3Al2(SiO4)3
Si ClinochloreMg5Al(AlSi3O10)(OH)8
PPhosphorus
P AlthausiteMg4(PO4)2(OH,O)(F,☐)
P ApatiteCa5(PO4)3(Cl/F/OH)
P CollinsiteCa2Mg(PO4)2 · 2H2O
P Phosphoellenbergerite(Mg,◻)2Mg12(PO4,PO3OH)6(PO3OH,CO3)2(OH)6
ClChlorine
Cl ApatiteCa5(PO4)3(Cl/F/OH)
CaCalcium
Ca ApatiteCa5(PO4)3(Cl/F/OH)
Ca CollinsiteCa2Mg(PO4)2 · 2H2O
Ca DolomiteCaMg(CO3)2
MnManganese
Mn Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
FeIron
Fe Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Fe HematiteFe2O3
NiNickel
Ni Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
ZnZinc
Zn Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn

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: 3151320
Proterozoic II quartzite

Age: Mesoproterozoic (1000 - 1600 Ma)

Description: undifferentiated metamorphic

Lithology: Quartzite

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)
Jøsang, O. (1966) Geologiske og petrologiske undersøkelser i Modumfeltet. Norges Geologiske Undersøkelse nr 235, 91-97.
Rømming, C. and Raade, G. (1980) The crystal structure of Althausite. American Mineralogist, 65, 488-498.
Witsø, T. (1994) Sjelden dolomitt fra Overntjern. STEIN 21 (3), 193.
Raade, G. (1999) Et unikt mineralselskap av magnesiumfosfater fra magnesitt-serpentin-forekomster på Modum. Bergverksmuseets Skrift nr 15, 10-14 [in Norwegian].
Nordrum, F.S. (2000) Nyfunn av mineraler i Norge 1999-2000. Bergverksmuseets Skrift 17:59-63 [on a find of phosphoellenbergerite].
Nordrum, F.S. (2006) Nyfunn av mineraler i Norge 2005-2006. Norsk Bergverksmuseum Skrift. 33: 56-62.
Raade, G. (2011) A metamict, thorium-rich magnesium phosphate from Overntjern, Modum, Norway. Norsk Bergverksmuseum Skrift. 46: 33-36.

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