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Feragen Chromium Mines, Røros, Trøndelag, Norwayi
Regional Level Types
Feragen Chromium MinesGroup of Mines
RørosMunicipality
TrøndelagCounty
NorwayCountry

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Latitude & Longitude (WGS84):
62° 37' 59'' North , 11° 34' 0'' East (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~0km
Locality type:
Group of Mines
Köppen climate type:
Other/historical names associated with this locality:
Sør-Trøndelag
Name(s) in local language(s):
Feragen Kromgruvefelt, Røros kommune, Sør-Trøndelag fylke, Norge


Podiform chromite deposits in variably serpentinised dunite and harzburgite. The chromite mineralisation is almost exclusively confined to the dunitic members which can be traced for more than 300 m along strike. The 235 occurrences which were exploited in this area yielded 32,500 metric tons of ore, representing about 90% of the total Norwegian chromite ore production.

Regions containing this locality

Eurasian PlateTectonic Plate
EuropeContinent
ScandinaviaRegion

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Standard Detailed Strunz Dana Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded from this region.


Mineral List

Mineral list contains entries from the region specified including sub-localities

14 valid minerals.

Detailed Mineral List:

Antigorite
Formula: Mg3(Si2O5)(OH)4
Reference: Hultin, I. (1968): Awaruite (Josephinite), a new mineral for Norway. Contribution to the Mineralogy of Norway, no 36. Norsk Geologisk Tidsskrift 48: 179-185
Awaruite
Formula: Ni3Fe
Brucite
Formula: Mg(OH)2
Reference: Neumann, H. (1985): Norges Mineraler. Norges Geologiske Undersøkelse Skrifter 68, p. 87.
'Chlorite Group'
Reference: Moore, A. C. & Hultin, I. (1980): Petrology, mineralogy, and origin of the Feragen ultramafic body, Sør-Trøndelag, Norway. Norsk Geologisk Tidsskrift 60, 235-254
Chromite
Formula: Fe2+Cr3+2O4
Localities: Reported from at least 7 localities in this region.
Chromite var: Ferrian Chromite
Formula: Fe2+(Cr,Fe3+)2O4
Reference: Moore, A. C. & Hultin, I. (1980): Petrology, mineralogy, and origin of the Feragen ultramafic body, Sør-Trøndelag, Norway. Norsk Geologisk Tidsskrift 60, 235-254
Clinochlore
Formula: Mg5Al(AlSi3O10)(OH)8
Description: Pseudomorphs after chrysotile
Reference: Hultin, I. (1968): Awaruite (Josephinite), a new mineral for Norway. Contribution to the Mineralogy of Norway, no 36. Norsk Geologisk Tidsskrift 48: 179-185
Clinochlore var: Chromian Clinochlore
Formula: Mg5(Al,Cr)2Si3O10(OH)8
Description: Pseudomorphs after chrysotile
Reference: Hultin, I. (1968): Awaruite (Josephinite), a new mineral for Norway. Contribution to the Mineralogy of Norway, no 36. Norsk Geologisk Tidsskrift 48: 179-185
Dypingite
Formula: Mg5(CO3)4(OH)2 · 5H2O
Habit: as crust on serpentine
Colour: white; colorless
Description: Nice waterclear crystals can be found together with white hydromagnesite in several of the mines in the Feragen field.
Reference: XRD at Natural History Museum, Oslo, Norway on specimen collected by Knut Eldjarn in 1973
'Fayalite-Forsterite Series'
Hydromagnesite
Formula: Mg5(CO3)4(OH)2 · 4H2O
Reference: Neumann, H. (1985): Norges Mineraler. Norges Geologiske Undersøkelse Skrifter 68, p. 102.
Lansfordite
Formula: MgCO3 · 5H2O
Description: Found as 2-4mm large crystals in fractures in serpentine. Hultin describe lansfordite already in his unpublished master-tesis in 1965.
Reference: Moore, A. C. & Hultin, I. (1980): Petrology, mineralogy, and origin of the Feragen ultramafic body, Sør-Trøndelag, Norway. Norsk Geologisk Tidsskrift 60, 235-254
Magnesite
Formula: MgCO3
Reference: Moore, A. C. & Hultin, I. (1980): Petrology, mineralogy, and origin of the Feragen ultramafic body, Sør-Trøndelag, Norway. Norsk Geologisk Tidsskrift 60, 235-254
Magnetite
Formula: Fe2+Fe3+2O4
Reference: Moore, A. C. & Hultin, I. (1980): Petrology, mineralogy, and origin of the Feragen ultramafic body, Sør-Trøndelag, Norway. Norsk Geologisk Tidsskrift 60, 235-254
Nesquehonite
Formula: MgCO3 · 3H2O
Description: Moore & Hultin (1980) describes crystals to 10mm in fractures in serpentine. Hultine described Nesquehonite already in 1965 in his unpublished master-tesis.
Reference: Moore, A. C. & Hultin, I. (1980): Petrology, mineralogy, and origin of the Feragen ultramafic body, Sør-Trøndelag, Norway. Norsk Geologisk Tidsskrift 60, 235-254
Pyrite
Formula: FeS2
Reference: Prestvik, T. (1974): Norwegian chromian ugrandite-garnets. Contribution to the mineralogy of Norway, no 55. Norsk Geologisk Tidsskrift, 54, 177-182
'Pyroxene Group'
Reference: Moore, A. C. & Hultin, I. (1980): Petrology, mineralogy, and origin of the Feragen ultramafic body, Sør-Trøndelag, Norway. Norsk Geologisk Tidsskrift 60, 235-254
'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Talc
Formula: Mg3Si4O10(OH)2
Reference: Hultin, I. (1968): Awaruite (Josephinite), a new mineral for Norway. Contribution to the Mineralogy of Norway, no 36. Norsk Geologisk Tidsskrift 48: 179-185
Uvarovite
Formula: Ca3Cr2(SiO4)3
Colour: emerald green
Reference: Prestvik, T. (1974): Norwegian chromian ugrandite-garnets. Contribution to the mineralogy of Norway, no 55. Norsk Geologisk Tidsskrift, 54, 177-182

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Awaruite1.AE.20Ni3Fe
Group 2 - Sulphides and Sulfosalts
Pyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
Brucite4.FE.05Mg(OH)2
Chromite4.BB.05Fe2+Cr3+2O4
var: Ferrian Chromite4.BB.05Fe2+(Cr,Fe3+)2O4
Magnetite4.BB.05Fe2+Fe3+2O4
Group 5 - Nitrates and Carbonates
Dypingite5.DA.05Mg5(CO3)4(OH)2 · 5H2O
Hydromagnesite5.DA.05Mg5(CO3)4(OH)2 · 4H2O
Lansfordite5.CA.10MgCO3 · 5H2O
Magnesite5.AB.05MgCO3
Nesquehonite5.CA.05MgCO3 · 3H2O
Group 9 - Silicates
Antigorite9.ED.15Mg3(Si2O5)(OH)4
Clinochlore9.EC.55Mg5Al(AlSi3O10)(OH)8
var: Chromian Clinochlore9.EC.55Mg5(Al,Cr)2Si3O10(OH)8
Talc9.EC.05Mg3Si4O10(OH)2
Uvarovite9.AD.25Ca3Cr2(SiO4)3
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-
'Fayalite-Forsterite Series'-
'Pyroxene Group'-
'Serpentine Subgroup'-D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Awaruite1.1.11.4Ni3Fe
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
X(OH)2
Brucite6.2.1.1Mg(OH)2
Group 7 - MULTIPLE OXIDES
AB2X4
Chromite7.2.3.3Fe2+Cr3+2O4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 13 - ACID CARBONATES
Miscellaneous
Nesquehonite13.1.5.1MgCO3 · 3H2O
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Magnesite14.1.1.2MgCO3
Group 15 - HYDRATED NORMAL CARBONATES
A(XO3)·xH2O
Lansfordite15.1.6.1MgCO3 · 5H2O
Group 16b - HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
Dypingite16b.7.2.1Mg5(CO3)4(OH)2 · 5H2O
Hydromagnesite16b.7.1.1Mg5(CO3)4(OH)2 · 4H2O
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Uvarovite51.4.3b.3Ca3Cr2(SiO4)3
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 1:1 layers
Antigorite71.1.2a.1Mg3(Si2O5)(OH)4
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.
'Chlorite Group'-
Chromite
var: Ferrian Chromite
-Fe2+(Cr,Fe3+)2O4
Clinochlore
var: Chromian Clinochlore
-Mg5(Al,Cr)2Si3O10(OH)8
'Fayalite-Forsterite Series'-
'Pyroxene Group'-
'Serpentine Subgroup'-D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn

List of minerals for each chemical element

HHydrogen
H Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
H BruciteMg(OH)2
H NesquehoniteMgCO3 · 3H2O
H LansforditeMgCO3 · 5H2O
H HydromagnesiteMg5(CO3)4(OH)2 · 4H2O
H DypingiteMg5(CO3)4(OH)2 · 5H2O
H AntigoriteMg3(Si2O5)(OH)4
H TalcMg3Si4O10(OH)2
H Clinochlore (var: Chromian Clinochlore)Mg5(Al,Cr)2Si3O10(OH)8
H ClinochloreMg5Al(AlSi3O10)(OH)8
CCarbon
C MagnesiteMgCO3
C NesquehoniteMgCO3 · 3H2O
C LansforditeMgCO3 · 5H2O
C HydromagnesiteMg5(CO3)4(OH)2 · 4H2O
C DypingiteMg5(CO3)4(OH)2 · 5H2O
OOxygen
O MagnetiteFe2+Fe23+O4
O ChromiteFe2+Cr23+O4
O Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
O BruciteMg(OH)2
O MagnesiteMgCO3
O NesquehoniteMgCO3 · 3H2O
O LansforditeMgCO3 · 5H2O
O HydromagnesiteMg5(CO3)4(OH)2 · 4H2O
O UvaroviteCa3Cr2(SiO4)3
O DypingiteMg5(CO3)4(OH)2 · 5H2O
O AntigoriteMg3(Si2O5)(OH)4
O TalcMg3Si4O10(OH)2
O Clinochlore (var: Chromian Clinochlore)Mg5(Al,Cr)2Si3O10(OH)8
O Chromite (var: Ferrian Chromite)Fe2+(Cr,Fe3+)2O4
O ClinochloreMg5Al(AlSi3O10)(OH)8
MgMagnesium
Mg Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Mg BruciteMg(OH)2
Mg MagnesiteMgCO3
Mg NesquehoniteMgCO3 · 3H2O
Mg LansforditeMgCO3 · 5H2O
Mg HydromagnesiteMg5(CO3)4(OH)2 · 4H2O
Mg DypingiteMg5(CO3)4(OH)2 · 5H2O
Mg AntigoriteMg3(Si2O5)(OH)4
Mg TalcMg3Si4O10(OH)2
Mg Clinochlore (var: Chromian Clinochlore)Mg5(Al,Cr)2Si3O10(OH)8
Mg ClinochloreMg5Al(AlSi3O10)(OH)8
AlAluminium
Al Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Al Clinochlore (var: Chromian Clinochlore)Mg5(Al,Cr)2Si3O10(OH)8
Al ClinochloreMg5Al(AlSi3O10)(OH)8
SiSilicon
Si Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Si UvaroviteCa3Cr2(SiO4)3
Si AntigoriteMg3(Si2O5)(OH)4
Si TalcMg3Si4O10(OH)2
Si Clinochlore (var: Chromian Clinochlore)Mg5(Al,Cr)2Si3O10(OH)8
Si ClinochloreMg5Al(AlSi3O10)(OH)8
SSulfur
S PyriteFeS2
CaCalcium
Ca UvaroviteCa3Cr2(SiO4)3
CrChromium
Cr ChromiteFe2+Cr23+O4
Cr UvaroviteCa3Cr2(SiO4)3
Cr Clinochlore (var: Chromian Clinochlore)Mg5(Al,Cr)2Si3O10(OH)8
Cr Chromite (var: Ferrian Chromite)Fe2+(Cr,Fe3+)2O4
MnManganese
Mn Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
FeIron
Fe AwaruiteNi3Fe
Fe MagnetiteFe2+Fe23+O4
Fe ChromiteFe2+Cr23+O4
Fe Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Fe Chromite (var: Ferrian Chromite)Fe2+(Cr,Fe3+)2O4
Fe PyriteFeS2
NiNickel
Ni AwaruiteNi3Fe
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)
Hultin, I. (1968): Awaruite (Josephinite), a new mineral for Norway. Contribution to the Mineralogy of Norway, no 36. Norsk Geologisk Tidsskrift 48: 179-185
Nilsson, L.P. (1977): En malmgeologisk undersøkelse av kromittforekomstene i Feragenfeltet. Diplomoppgave, NTH, Trondheim (unpublished thesis).
Moore, A. C. & Hultin, I. (1980): Petrology, mineralogy, and origin of the Feragen ultramafic body, Sør-Trøndelag, Norway. Norsk Geologisk Tidsskrift 60, 235-254.
Grenne, T., Ihlen, P.M., and Vokes, F.M. (1999): Scandinavian Caledonide Metallogeny in a plate tectonic perspective. Mineralium Deposita 34, 422-471.

Localities in this Region
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