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Mjønes Tunnel, Åstfjorden, Snillfjord, Orkland, Trøndelag, Norwayi
| Regional Level Types | |
|---|---|
| Mjønes Tunnel | Tunnel |
| Åstfjorden | Fjord |
| Snillfjord | Municipality (Former) |
| Orkland | Municipality |
| Trøndelag | County |
| Norway | Country |
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Latitude & Longitude (WGS84):
63° 28' 13'' North , 9° 25' 33'' East
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Hestvika | 241 (2018) | 15.6km |
| Selbekken | 376 (2018) | 20.2km |
| Gjølme | 478 (2018) | 25.7km |
| Kyrksæterøra | 2,471 (2018) | 26.1km |
| Brekstad | 1,835 (2018) | 26.8km |
Other Languages:
Norwegian:
Mjønestunnelen, Åstfjorden, Snillfjord, Orkland, Trøndelag, Norge
During construction of a new road tunnel a huge lense (several thousand cubic metres) of a pink zoisite-bearing rock, populary called thulite was found. Several minerals occur together in/with the zoisite. Very rarely, euhedral crystals of pink zoisite were found in calcite-filled veins.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsMineral List
14 valid minerals. 1 erroneous literature entry.
Rock Types Recorded
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
| ⓘ 'Andradite-Grossular Series' |
| ⓘ 'Apatite' Formula: Ca5(PO4)3A |
| ⓘ Augite ? Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| ⓘ Calcite Formula: CaCO3 |
| ⓘ Clinochlore Formula: Mg5Al(AlSi3O10)(OH)8 |
| ⓘ Clinozoisite Formula: (CaCa)(AlAlAl)O[Si2O7][SiO4](OH) |
| ⓘ Diopside Formula: CaMgSi2O6 |
| ⓘ Epidote Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| ⓘ 'Feldspar Group' |
| ⓘ Hematite Formula: Fe2O3 |
| ⓘ Muscovite Formula: KAl2(AlSi3O10)(OH)2 |
| ⓘ Muscovite var. Sericite Formula: KAl2(AlSi3O10)(OH)2 |
| ⓘ Formula: (CaCa)(AlAlMn3+)O[Si2O7][SiO4](OH) Description: First only visually identified and tentatively identified as piemontite(Størseth 2019 a). Later shown by PXRD/SEM to be epidote/Mn-rich epidote in composition(Størseth 2019b) |
| ⓘ 'Plagioclase' Formula: (Na,Ca)[(Si,Al)AlSi2]O8 |
| ⓘ Prehnite Formula: Ca2Al2Si3O10(OH)2 |
| ⓘ 'Pyrochlore Group' ? Formula: A2Nb2(O,OH)6Z |
| ⓘ 'Pyrochlore Group var. Uranpyrochlore (of Hogarth 1977)' ? Formula: (Ca,U,Ce)2(Nb,Ti,Ta)2O6(OH,F) Habit: Primary dark brownish grains with a greasy lustre alongside a secondary unknown yellow phase (under work) Description: Reported in Størseth (2019). The chemical composition of a dark brownish grains with a greasy lustre was found to be: Nb2O5: 29.5%, Ta2O5: 2.3% , SiO2:2.6%, TiO2: 18,1%; UO2: 36.9%, Al2O3: 0.3% , Fe2O3 2.3%, Cao 7.3%, F 0.7%.
Analysis by Alf Olav Larsen
It was found that it might have similarities with "uranpyrochlore".
The analyzed specimen had a yellowish-orange secondary phase. Newer analytical work by T. Husdal possibly points towards carlosbarbosaite for this phase, but analytical work is still under way (status: June 2026). |
| ⓘ 'Pyroxene Group' Formula: ADSi2O6 |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Rhodochrosite Formula: MnCO3 |
| ⓘ Titanite Formula: CaTiO(SiO4) |
| ⓘ Vesuvianite Formula: Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 References: |
| ⓘ Zoisite Formula: (CaCa)(AlAlAl)O[Si2O7][SiO4](OH) Description: In the book "Norges Mineraler" by Lars O. Kvamsdal the following is written about the zoisite from Mjønes: The Mn-content is to low for the mineral to be called thulite (Støreseth 2019) and Støreseth (2019b) |
| ⓘ Zoisite var. Thulite Formula: (Ca2)(Al,Mn3+)3(Si2O7)(SiO4)O(OH) Description: By definition, thulite is a pink variety of zoisite with a variable manganese content. The pink zoisite -bearing rock found at Mjønes Tunnel is populary as a whole called thulite. The "Thulite"- rock contains beside a pink variety of zoisite, varying amounts of minerals such as quartz, piemontite, feldspar, and tremolite. PXRD analysis confirms that the pink mineral labelled by collectors as "thulite" is zoisite. SEM/EDS analyses of the pink zoisite indicate 0.1 wt% Mn₂O₃, a relatively low manganese content (Størseth 2019)[[1]] and Størseth (2019) [[2]].
In the book "Minerals of Norway" by Lars Olav Kvamsdal (2023) [[3]] the following is written about the zoisite from Mjønes: "The Mn-content is to low for the mineral to be called thulite (Størseth 2019) and Størseth (2019b)". However, since, by definition thulite is a pink variety of zoisite and it's generally based definition is not based on the content of Mn, but the color, thulite (as the poink variety of zoisite) does occur at Mjønes. References: [1]Størseth, Leif Roger (2019) Nytt thulittfunn i Åstfjorden, Trøndelag [New thulite discovery in Åstfjorden, Trøndelag]. STEIN. Magasin for populærgeologi, 46 (1). 9-17 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | 'Pyrochlore Group' ? | 4.00. | A2Nb2(O,OH)6Z |
| ⓘ | 'var. Uranpyrochlore (of Hogarth 1977)' ? | 4.00. | (Ca,U,Ce)2(Nb,Ti,Ta)2O6(OH,F) |
| ⓘ | Quartz | 4.00.05 | SiO2 |
| ⓘ | Hematite | 4.CB.05 | Fe2O3 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
| ⓘ | Rhodochrosite | 5.AB.05 | MnCO3 |
| Group 9 - Silicates | |||
| ⓘ | Titanite | 9.AG.15 | CaTiO(SiO4) |
| ⓘ | Clinozoisite | 9.BG.05a | (CaCa)(AlAlAl)O[Si2O7][SiO4](OH) |
| ⓘ | Epidote | 9.BG.05a | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| ⓘ | Piemontite ? | 9.BG.05a | (CaCa)(AlAlMn3+)O[Si2O7][SiO4](OH) |
| ⓘ | Zoisite var. Thulite | 9.BG.10 | (Ca2)(Al,Mn3+)3(Si2O7)(SiO4)O(OH) |
| ⓘ | 9.BG.10 | (CaCa)(AlAlAl)O[Si2O7][SiO4](OH) | |
| ⓘ | Vesuvianite | 9.BG.35 | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
| ⓘ | Augite ? | 9.DA.15 | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| ⓘ | Diopside | 9.DA.15 | CaMgSi2O6 |
| ⓘ | Prehnite | 9.DP.20 | Ca2Al2Si3O10(OH)2 |
| ⓘ | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| ⓘ | var. Sericite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| ⓘ | Clinochlore | 9.EC.55 | Mg5Al(AlSi3O10)(OH)8 |
| Unclassified | |||
| ⓘ | 'Feldspar Group' | - | |
| ⓘ | 'Andradite-Grossular Series' | - | |
| ⓘ | 'Plagioclase' | - | (Na,Ca)[(Si,Al)AlSi2]O8 |
| ⓘ | 'Pyroxene Group' | - | ADSi2O6 |
| ⓘ | 'Apatite' | - | Ca5(PO4)3A |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Clinochlore | Mg5Al(AlSi3O10)(OH)8 |
| H | ⓘ Clinozoisite | (CaCa)(AlAlAl)O[Si2O7][SiO4](OH) |
| H | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| H | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| H | ⓘ Piemontite | (CaCa)(AlAlMn3+)O[Si2O7][SiO4](OH) |
| H | ⓘ Prehnite | Ca2Al2Si3O10(OH)2 |
| H | ⓘ Pyrochlore Group | A2Nb2(O,OH)6Z |
| H | ⓘ Zoisite var. Thulite | (Ca2)(Al,Mn3+)3(Si2O7)(SiO4)O(OH) |
| H | ⓘ Pyrochlore Group var. Uranpyrochlore (of Hogarth 1977) | (Ca,U,Ce)2(Nb,Ti,Ta)2O6(OH,F) |
| H | ⓘ Vesuvianite | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
| H | ⓘ Zoisite | (CaCa)(AlAlAl)O[Si2O7][SiO4](OH) |
| H | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| C | Carbon | |
| C | ⓘ Calcite | CaCO3 |
| C | ⓘ Rhodochrosite | MnCO3 |
| O | Oxygen | |
| O | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| O | ⓘ Calcite | CaCO3 |
| O | ⓘ Clinochlore | Mg5Al(AlSi3O10)(OH)8 |
| O | ⓘ Clinozoisite | (CaCa)(AlAlAl)O[Si2O7][SiO4](OH) |
| O | ⓘ Diopside | CaMgSi2O6 |
| O | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| O | ⓘ Hematite | Fe2O3 |
| O | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| O | ⓘ Piemontite | (CaCa)(AlAlMn3+)O[Si2O7][SiO4](OH) |
| O | ⓘ Prehnite | Ca2Al2Si3O10(OH)2 |
| O | ⓘ Pyrochlore Group | A2Nb2(O,OH)6Z |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Rhodochrosite | MnCO3 |
| O | ⓘ Zoisite var. Thulite | (Ca2)(Al,Mn3+)3(Si2O7)(SiO4)O(OH) |
| O | ⓘ Titanite | CaTiO(SiO4) |
| O | ⓘ Pyrochlore Group var. Uranpyrochlore (of Hogarth 1977) | (Ca,U,Ce)2(Nb,Ti,Ta)2O6(OH,F) |
| O | ⓘ Vesuvianite | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
| O | ⓘ Zoisite | (CaCa)(AlAlAl)O[Si2O7][SiO4](OH) |
| O | ⓘ Andradite-Grossular Series | |
| O | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| O | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| O | ⓘ Pyroxene Group | ADSi2O6 |
| O | ⓘ Apatite | Ca5(PO4)3A |
| F | Fluorine | |
| F | ⓘ Pyrochlore Group var. Uranpyrochlore (of Hogarth 1977) | (Ca,U,Ce)2(Nb,Ti,Ta)2O6(OH,F) |
| Na | Sodium | |
| Na | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Mg | Magnesium | |
| Mg | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| Mg | ⓘ Clinochlore | Mg5Al(AlSi3O10)(OH)8 |
| Mg | ⓘ Diopside | CaMgSi2O6 |
| Mg | ⓘ Vesuvianite | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
| Al | Aluminium | |
| Al | ⓘ Clinochlore | Mg5Al(AlSi3O10)(OH)8 |
| Al | ⓘ Clinozoisite | (CaCa)(AlAlAl)O[Si2O7][SiO4](OH) |
| Al | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Al | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Al | ⓘ Piemontite | (CaCa)(AlAlMn3+)O[Si2O7][SiO4](OH) |
| Al | ⓘ Prehnite | Ca2Al2Si3O10(OH)2 |
| Al | ⓘ Zoisite var. Thulite | (Ca2)(Al,Mn3+)3(Si2O7)(SiO4)O(OH) |
| Al | ⓘ Vesuvianite | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
| Al | ⓘ Zoisite | (CaCa)(AlAlAl)O[Si2O7][SiO4](OH) |
| Al | ⓘ Andradite-Grossular Series | |
| Al | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Al | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Si | Silicon | |
| Si | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| Si | ⓘ Clinochlore | Mg5Al(AlSi3O10)(OH)8 |
| Si | ⓘ Clinozoisite | (CaCa)(AlAlAl)O[Si2O7][SiO4](OH) |
| Si | ⓘ Diopside | CaMgSi2O6 |
| Si | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Si | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Si | ⓘ Piemontite | (CaCa)(AlAlMn3+)O[Si2O7][SiO4](OH) |
| Si | ⓘ Prehnite | Ca2Al2Si3O10(OH)2 |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Zoisite var. Thulite | (Ca2)(Al,Mn3+)3(Si2O7)(SiO4)O(OH) |
| Si | ⓘ Titanite | CaTiO(SiO4) |
| Si | ⓘ Vesuvianite | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
| Si | ⓘ Zoisite | (CaCa)(AlAlAl)O[Si2O7][SiO4](OH) |
| Si | ⓘ Andradite-Grossular Series | |
| Si | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Si | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Si | ⓘ Pyroxene Group | ADSi2O6 |
| P | Phosphorus | |
| P | ⓘ Apatite | Ca5(PO4)3A |
| K | Potassium | |
| K | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| K | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Ca | Calcium | |
| Ca | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| Ca | ⓘ Calcite | CaCO3 |
| Ca | ⓘ Clinozoisite | (CaCa)(AlAlAl)O[Si2O7][SiO4](OH) |
| Ca | ⓘ Diopside | CaMgSi2O6 |
| Ca | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Ca | ⓘ Piemontite | (CaCa)(AlAlMn3+)O[Si2O7][SiO4](OH) |
| Ca | ⓘ Prehnite | Ca2Al2Si3O10(OH)2 |
| Ca | ⓘ Zoisite var. Thulite | (Ca2)(Al,Mn3+)3(Si2O7)(SiO4)O(OH) |
| Ca | ⓘ Titanite | CaTiO(SiO4) |
| Ca | ⓘ Pyrochlore Group var. Uranpyrochlore (of Hogarth 1977) | (Ca,U,Ce)2(Nb,Ti,Ta)2O6(OH,F) |
| Ca | ⓘ Vesuvianite | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
| Ca | ⓘ Zoisite | (CaCa)(AlAlAl)O[Si2O7][SiO4](OH) |
| Ca | ⓘ Andradite-Grossular Series | |
| Ca | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Ca | ⓘ Apatite | Ca5(PO4)3A |
| Ti | Titanium | |
| Ti | ⓘ Titanite | CaTiO(SiO4) |
| Ti | ⓘ Pyrochlore Group var. Uranpyrochlore (of Hogarth 1977) | (Ca,U,Ce)2(Nb,Ti,Ta)2O6(OH,F) |
| Mn | Manganese | |
| Mn | ⓘ Piemontite | (CaCa)(AlAlMn3+)O[Si2O7][SiO4](OH) |
| Mn | ⓘ Rhodochrosite | MnCO3 |
| Mn | ⓘ Zoisite var. Thulite | (Ca2)(Al,Mn3+)3(Si2O7)(SiO4)O(OH) |
| Fe | Iron | |
| Fe | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| Fe | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Fe | ⓘ Hematite | Fe2O3 |
| Fe | ⓘ Vesuvianite | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
| Fe | ⓘ Andradite-Grossular Series | |
| Nb | Niobium | |
| Nb | ⓘ Pyrochlore Group | A2Nb2(O,OH)6Z |
| Nb | ⓘ Pyrochlore Group var. Uranpyrochlore (of Hogarth 1977) | (Ca,U,Ce)2(Nb,Ti,Ta)2O6(OH,F) |
| Ce | Cerium | |
| Ce | ⓘ Pyrochlore Group var. Uranpyrochlore (of Hogarth 1977) | (Ca,U,Ce)2(Nb,Ti,Ta)2O6(OH,F) |
| Ta | Tantalum | |
| Ta | ⓘ Pyrochlore Group var. Uranpyrochlore (of Hogarth 1977) | (Ca,U,Ce)2(Nb,Ti,Ta)2O6(OH,F) |
| U | Uranium | |
| U | ⓘ Pyrochlore Group var. Uranpyrochlore (of Hogarth 1977) | (Ca,U,Ce)2(Nb,Ti,Ta)2O6(OH,F) |
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References
Størseth, Leif Roger (2019) Nytt thulittfunn i Åstfjorden, Trøndelag [New thulite discovery in Åstfjorden, Trøndelag]. STEIN. Magasin for populærgeologi, 46 (1). 9-17
Mjønes Tunnel, Åstfjorden, Snillfjord, Orkland, Trøndelag, Norway