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Hortavær Complex, Leka, Trøndelag, Norwayi
Regional Level Types
Hortavær ComplexGroup of Islands
LekaMunicipality
TrøndelagCounty
NorwayCountry

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Latitude & Longitude (WGS84):
65° 12' 26'' North , 11° 26' 12'' East
Latitude & Longitude (decimal):
65.20723,11.43694
GeoHash:
G#: u784uq85e
GRN:
N44E04
Area:
25 km2
Type:
Group of Islands
Mindat Locality ID:
106439
Long-form identifier:
mindat:1:2:106439:4
GUID (UUID V4):
23936557-0147-4c2c-8e88-00983bbb5270
Other/historical names associated with this locality:
Horta
Other Languages:
Norwegian:
Hortavær, Leka, Trøndelag, Norge


Geographically Hortavær consists of 360 skerries, small islets and islands W of Leka Island. Geologically, the area belongs to the Hortavær Igneous Complex (465 Ma), a part of the Bindal batolith (482-425 Ma)

Complex is built of multiple sheets of gabbro, diorite, monzonite and syenite, which are cut by granite dikes (Barnes et al. 2003, 2005). The rocks are exposed on numerous small islands and skerries that extend over an area of c. 9 x 5 km (Prestvik & Barnes 2007).

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List

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

11 valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

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

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

ⓘ Aegirine
Formula: NaFe3+Si2O6
Habit: elongated prismatic xls to 4mm
Colour: Apple-green
ⓘ Augite
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
ⓘ 'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘ Calcite
Formula: CaCO3
ⓘ Cordierite
Formula: (Mg,Fe)2Al3(AlSi5O18)
ⓘ Ilmenite
Formula: Fe2+TiO3
ⓘ 'K Feldspar'
ⓘ 'Plagioclase'
Formula: (Na,Ca)[(Si,Al)AlSi2]O8
ⓘ Pyrite
Formula: FeS2
ⓘ Riebeckite
Formula: ◻[Na2][Fe2+3Fe3+2]Si8O22(OH)2
ⓘ Sillimanite
Formula: Al2(SiO4)O
ⓘ Stilpnomelane
Formula: (K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
ⓘ Titanite
Formula: CaTi(SiO4)O
ⓘ Vesuvianite
Formula: Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘPyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
ⓘIlmenite4.CB.05Fe2+TiO3
Group 5 - Nitrates and Carbonates
ⓘCalcite5.AB.05CaCO3
Group 9 - Silicates
ⓘSillimanite9.AF.05Al2(SiO4)O
ⓘTitanite9.AG.15CaTi(SiO4)O
ⓘVesuvianite9.BG.35Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9
ⓘCordierite9.CJ.10(Mg,Fe)2Al3(AlSi5O18)
ⓘAugite9.DA.15(CaxMgyFez)(Mgy1Fez1)Si2O6
ⓘAegirine9.DA.25NaFe3+Si2O6
ⓘRiebeckite9.DE.25◻[Na2][Fe2+3Fe3+2]Si8O22(OH)2
ⓘStilpnomelane9.EG.40(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Unclassified
ⓘ'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘ'Plagioclase'-(Na,Ca)[(Si,Al)AlSi2]O8
ⓘ'K Feldspar'-

List of minerals for each chemical element

HHydrogen
Hⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Hⓘ Riebeckite◻[Na2][Fe32+Fe23+]Si8O22(OH)2
Hⓘ Stilpnomelane(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Hⓘ VesuvianiteCa19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9
CCarbon
Cⓘ CalciteCaCO3
OOxygen
Oⓘ AegirineNaFe3+Si2O6
Oⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Oⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Oⓘ CalciteCaCO3
Oⓘ Cordierite(Mg,Fe)2Al3(AlSi5O18)
Oⓘ IlmeniteFe2+TiO3
Oⓘ Riebeckite◻[Na2][Fe32+Fe23+]Si8O22(OH)2
Oⓘ SillimaniteAl2(SiO4)O
Oⓘ Stilpnomelane(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Oⓘ TitaniteCaTi(SiO4)O
Oⓘ VesuvianiteCa19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9
Oⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
FFluorine
Fⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
NaSodium
Naⓘ AegirineNaFe3+Si2O6
Naⓘ Riebeckite◻[Na2][Fe32+Fe23+]Si8O22(OH)2
Naⓘ Stilpnomelane(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Naⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
MgMagnesium
Mgⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Mgⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Mgⓘ Cordierite(Mg,Fe)2Al3(AlSi5O18)
Mgⓘ Stilpnomelane(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Mgⓘ VesuvianiteCa19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9
AlAluminium
Alⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Alⓘ Cordierite(Mg,Fe)2Al3(AlSi5O18)
Alⓘ SillimaniteAl2(SiO4)O
Alⓘ Stilpnomelane(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Alⓘ VesuvianiteCa19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9
Alⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
SiSilicon
Siⓘ AegirineNaFe3+Si2O6
Siⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Siⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Siⓘ Cordierite(Mg,Fe)2Al3(AlSi5O18)
Siⓘ Riebeckite◻[Na2][Fe32+Fe23+]Si8O22(OH)2
Siⓘ SillimaniteAl2(SiO4)O
Siⓘ Stilpnomelane(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Siⓘ TitaniteCaTi(SiO4)O
Siⓘ VesuvianiteCa19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9
Siⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
SSulfur
Sⓘ PyriteFeS2
KPotassium
Kⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Kⓘ Stilpnomelane(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
CaCalcium
Caⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Caⓘ CalciteCaCO3
Caⓘ Stilpnomelane(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Caⓘ TitaniteCaTi(SiO4)O
Caⓘ VesuvianiteCa19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9
Caⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
TiTitanium
Tiⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Tiⓘ IlmeniteFe2+TiO3
Tiⓘ TitaniteCaTi(SiO4)O
FeIron
Feⓘ AegirineNaFe3+Si2O6
Feⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Feⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Feⓘ Cordierite(Mg,Fe)2Al3(AlSi5O18)
Feⓘ IlmeniteFe2+TiO3
Feⓘ PyriteFeS2
Feⓘ Riebeckite◻[Na2][Fe32+Fe23+]Si8O22(OH)2
Feⓘ Stilpnomelane(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Feⓘ VesuvianiteCa19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9

Geochronology

Mineralization age: Late/Upper Ordovician : 455.7 ± 8.4 Ma

Important note: This table is based only on rock and mineral ages recorded on mindat.org for this locality and is not necessarily a complete representation of the geochronology, but does give an indication of possible mineralization events relevant to this locality. As more age information is added this table may expand in the future. A break in the table simply indicates a lack of data entered here, not necessarily a break in the geologic sequence. Grey background entries are from different, related, localities.

Geologic TimeRocks, Minerals and Events
Phanerozoic
 Paleozoic
  Ordovician
   Late/Upper Ordovician
ⓘ Titanite455.7 ± 8.4 Ma

Localities in this Region

Norway

Other Regions, Features and Areas containing this locality

Eurasian PlateTectonic Plate
ScandinaviaRegion

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Gustavson, M. & Prestvik, T. (1979): The igneous complex of Hortavær, Nord-Trøndelag, central Norway. Norges Geologiske Undersøkelse, 348:73-92
Barnes, Calvin G., Prestvik, Tore, Barnes, Melanie A., Anthony, Elizabeth Y., Allen, Charlotte M. (2003) Geology of a magma transfer zone: the Hortavær Igneous Complex, north-central Norway. Norwegian Journal of Geology (Norsk Geologisk Tidsskrift), 83 (3) 187-208
Barnes, Calvin G., Prestvik, Tore, Sundvoll, Bjørn, Surratt, Denny (2005) Pervasive assimilation of carbonate and silicate rocks in the Hortavær igneous complex, north-central Norway. Lithos, 80 (1) 179-199 doi:10.1016/j.lithos.2003.11.002
Prestvik, Tore, Barnes, Calvin G. (2007) A new occurrence of aegirine in Norway. Norwegian Journal of Geology (Norsk Geologisk Tidsskrift), 87 (4) 451-456
Woolley, Alan R. (2019) Alkaline Rocks and Carbonatites of the World. Part 4: Antarctica, Asia and Europe (excluding the former USSR), Australasia and Oceanic Islands. The Geological Society of London. doi:10.1144/mpar4
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