Overntjern Quarry, Overntjern, Modum, Buskerud, Norwayi
| Regional Level Types | |
|---|---|
| Overntjern Quarry | Quarry (Abandoned) |
| Overntjern | Lake |
| Modum | Municipality |
| Buskerud | County (Former) |
| Norway | Country |
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Latitude & Longitude (WGS84):
59° 57' 2'' North , 9° 51' 58'' East
Latitude & Longitude (decimal):
Type:
Quarry (Abandoned) - last checked 2021
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Vikersund | 2,448 (2016) | 7.2km |
| Nakkerud | 350 (2013) | 15.1km |
| Prestfoss | 465 (2014) | 16.5km |
| Tyristrand | 795 (2013) | 19.7km |
| Krøderen | 496 (2013) | 19.9km |
Nearest Clubs:
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Local clubs are the best way to get access to collecting localities
| Club | Location | Distance |
|---|---|---|
| Buskerud Geologiforening | Solbergelva | 24km |
Mindat Locality ID:
2496
Long-form identifier:
mindat:1:2:2496:2
GUID (UUID V4):
614d1a2b-e51d-4297-959d-320e3a753bbe
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.
Note: 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 Gallery Strunz Chemical ElementsCommodity 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,◻) Description: It is gray in color because of inclusions of magnetite and xenotime. It is also intimately associated with apatite. It occurs in cleavable masses up to several hundred grams and is altered to apatite along the cleavages. |
| ⓘ 'Apatite' Formula: Ca5(PO4)3(Cl/F/OH) Colour: brown |
| ⓘ Brucite Formula: Mg(OH)2 |
| ⓘ Clinochlore Formula: Mg5Al(AlSi3O10)(OH)8 References: |
| ⓘ Clinochlore var. Leuchtenbergite Formula: Mg5Al(AlSi3O10)(OH)8 References: |
| ⓘ Collinsite Formula: Ca2Mg(PO4)2 · 2H2O Description: As replacement of reddish althausite. |
| ⓘ Dolomite Formula: CaMg(CO3)2 |
| ⓘ Enstatite Formula: Mg2Si2O6 |
| ⓘ Hematite Formula: Fe2O3 References: |
| ⓘ Magnesite Formula: MgCO3 Habit: massive cleavages Colour: white, pale pink |
| ⓘ Phosphoellenbergerite Formula: (Mg,◻)2Mg12(PO4,PO3OH)6(PO3OH,CO3)2(OH)6 |
| ⓘ Pyrope Formula: Mg3Al2(SiO4)3 |
| ⓘ 'Serpentine Subgroup' Formula: D3[Si2O5](OH)4 |
| ⓘ Talc Formula: Mg3Si4O10(OH)2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Hematite | 4.CB.05 | Fe2O3 |
| ⓘ | Brucite | 4.FE.05 | Mg(OH)2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Magnesite | 5.AB.05 | MgCO3 |
| ⓘ | Dolomite | 5.AB.10 | CaMg(CO3)2 |
| Group 8 - Phosphates, Arsenates and Vanadates | |||
| ⓘ | Althausite | 8.BB.25 | Mg4(PO4)2(OH,O)(F,◻) |
| ⓘ | Phosphoellenbergerite | 8.BB.55 | (Mg,◻)2Mg12(PO4,PO3OH)6(PO3OH,CO3)2(OH)6 |
| ⓘ | Collinsite | 8.CG.05 | Ca2Mg(PO4)2 · 2H2O |
| Group 9 - Silicates | |||
| ⓘ | Pyrope | 9.AD.25 | Mg3Al2(SiO4)3 |
| ⓘ | Enstatite | 9.DA.05 | Mg2Si2O6 |
| ⓘ | Talc | 9.EC.05 | Mg3Si4O10(OH)2 |
| ⓘ | Clinochlore | 9.EC.55 | Mg5Al(AlSi3O10)(OH)8 |
| ⓘ | var. Leuchtenbergite | 9.EC.55 | Mg5Al(AlSi3O10)(OH)8 |
| Unclassified | |||
| ⓘ | 'Serpentine Subgroup' | - | D3[Si2O5](OH)4 |
| ⓘ | 'Apatite' | - | Ca5(PO4)3(Cl/F/OH) |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Althausite | Mg4(PO4)2(OH,O)(F,◻) |
| H | ⓘ Brucite | Mg(OH)2 |
| H | ⓘ Clinochlore | Mg5Al(AlSi3O10)(OH)8 |
| H | ⓘ Collinsite | Ca2Mg(PO4)2 · 2H2O |
| H | ⓘ Talc | Mg3Si4O10(OH)2 |
| H | ⓘ Phosphoellenbergerite | (Mg,◻)2Mg12(PO4,PO3OH)6(PO3OH,CO3)2(OH)6 |
| H | ⓘ Clinochlore var. Leuchtenbergite | Mg5Al(AlSi3O10)(OH)8 |
| H | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| H | ⓘ Apatite | Ca5(PO4)3(Cl/F/OH) |
| C | Carbon | |
| C | ⓘ Dolomite | CaMg(CO3)2 |
| C | ⓘ Magnesite | MgCO3 |
| C | ⓘ Phosphoellenbergerite | (Mg,◻)2Mg12(PO4,PO3OH)6(PO3OH,CO3)2(OH)6 |
| O | Oxygen | |
| O | ⓘ Althausite | Mg4(PO4)2(OH,O)(F,◻) |
| O | ⓘ Brucite | Mg(OH)2 |
| O | ⓘ Clinochlore | Mg5Al(AlSi3O10)(OH)8 |
| O | ⓘ Collinsite | Ca2Mg(PO4)2 · 2H2O |
| O | ⓘ Dolomite | CaMg(CO3)2 |
| O | ⓘ Enstatite | Mg2Si2O6 |
| O | ⓘ Hematite | Fe2O3 |
| O | ⓘ Magnesite | MgCO3 |
| O | ⓘ Pyrope | Mg3Al2(SiO4)3 |
| O | ⓘ Talc | Mg3Si4O10(OH)2 |
| O | ⓘ Phosphoellenbergerite | (Mg,◻)2Mg12(PO4,PO3OH)6(PO3OH,CO3)2(OH)6 |
| O | ⓘ Clinochlore var. Leuchtenbergite | Mg5Al(AlSi3O10)(OH)8 |
| O | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| O | ⓘ Apatite | Ca5(PO4)3(Cl/F/OH) |
| F | Fluorine | |
| F | ⓘ Althausite | Mg4(PO4)2(OH,O)(F,◻) |
| F | ⓘ Apatite | Ca5(PO4)3(Cl/F/OH) |
| Mg | Magnesium | |
| Mg | ⓘ Althausite | Mg4(PO4)2(OH,O)(F,◻) |
| Mg | ⓘ Brucite | Mg(OH)2 |
| Mg | ⓘ Clinochlore | Mg5Al(AlSi3O10)(OH)8 |
| Mg | ⓘ Collinsite | Ca2Mg(PO4)2 · 2H2O |
| Mg | ⓘ Dolomite | CaMg(CO3)2 |
| Mg | ⓘ Enstatite | Mg2Si2O6 |
| Mg | ⓘ Magnesite | MgCO3 |
| Mg | ⓘ Pyrope | Mg3Al2(SiO4)3 |
| Mg | ⓘ Talc | Mg3Si4O10(OH)2 |
| Mg | ⓘ Phosphoellenbergerite | (Mg,◻)2Mg12(PO4,PO3OH)6(PO3OH,CO3)2(OH)6 |
| Mg | ⓘ Clinochlore var. Leuchtenbergite | Mg5Al(AlSi3O10)(OH)8 |
| Al | Aluminium | |
| Al | ⓘ Clinochlore | Mg5Al(AlSi3O10)(OH)8 |
| Al | ⓘ Pyrope | Mg3Al2(SiO4)3 |
| Al | ⓘ Clinochlore var. Leuchtenbergite | Mg5Al(AlSi3O10)(OH)8 |
| Si | Silicon | |
| Si | ⓘ Clinochlore | Mg5Al(AlSi3O10)(OH)8 |
| Si | ⓘ Enstatite | Mg2Si2O6 |
| Si | ⓘ Pyrope | Mg3Al2(SiO4)3 |
| Si | ⓘ Talc | Mg3Si4O10(OH)2 |
| Si | ⓘ Clinochlore var. Leuchtenbergite | Mg5Al(AlSi3O10)(OH)8 |
| Si | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| P | Phosphorus | |
| P | ⓘ Althausite | Mg4(PO4)2(OH,O)(F,◻) |
| P | ⓘ Collinsite | Ca2Mg(PO4)2 · 2H2O |
| P | ⓘ Phosphoellenbergerite | (Mg,◻)2Mg12(PO4,PO3OH)6(PO3OH,CO3)2(OH)6 |
| P | ⓘ Apatite | Ca5(PO4)3(Cl/F/OH) |
| Cl | Chlorine | |
| Cl | ⓘ Apatite | Ca5(PO4)3(Cl/F/OH) |
| Ca | Calcium | |
| Ca | ⓘ Collinsite | Ca2Mg(PO4)2 · 2H2O |
| Ca | ⓘ Dolomite | CaMg(CO3)2 |
| Ca | ⓘ Apatite | Ca5(PO4)3(Cl/F/OH) |
| Fe | Iron | |
| Fe | ⓘ Hematite | Fe2O3 |
Other Regions, Features and Areas containing this locality
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References
Rømming, Christian, Raade, Gunnar (1980) The crystal structure of althausite, Mg4(PO4)2(OH,O) (F,[]) American Mineralogist, 65 (5-6) 488-498
Witsø, Tor (1994) Sjelden dolomitt fra Overtjern. STEIN. Nordisk magasin for populær geologi, 21 (3) 193
Raade, Gunnar (1999) Et unikt mineralselskap av magnesiumfosfater fra magnesitt -serpentin -forekomster på Modum [An unique mineral assemblage of magnesium phospates from magnesite-serpentine localities in Modum]. Norsk Bergverksmuseum Skrift, 15. 11-14
Nordrum, Fred Steinar (2000) Nyfunn av mineraler i Norge 1999-2000. Norsk Bergverksmuseum Skrift, 17. 59-63
Overntjern Quarry, Overntjern, Modum, Buskerud, Norway