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

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Key
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/historical names associated with this locality:
Overngruve
Other Languages:
Norwegian:
Overntjern gruve, 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).

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

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


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: Mg2Si2O6
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.05Mg2Si2O6
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
Enstatite65.1.2.1Mg2Si2O6
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 EnstatiteMg2Si2O6
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 EnstatiteMg2Si2O6
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 EnstatiteMg2Si2O6
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

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.

External Links


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