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Kietyönmäki, Tammela, Kanta-Häme, Finlandi
Regional Level Types
KietyönmäkiPegmatite
TammelaMunicipality
Kanta-HämeRegion
FinlandCountry

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Latitude & Longitude (WGS84):
60° 43' 37'' North , 23° 31' 3'' East
Latitude & Longitude (decimal):
60.72720,23.51760
GeoHash:
G#: udb9rphcx
GRN:
N41E09
Type:
Pegmatite
Köppen climate type:
Dfb : Warm-summer humid continental climate
Nearest Settlements:
PlacePopulationDistance
Jokioinen5,568 (2014)8.5km
Forssa17,852 (2014)11.2km
Somero9,840 (2014)12.3km
Ypäjä2,659 (2014)15.1km
Tammela6,519 (2014)16.4km
Mindat Locality ID:
209555
Long-form identifier:
mindat:1:2:209555:7
GUID (UUID V4):
0


The pegmatites of the Somero–Tammela region were discovered in late 18th century and supported the local ceramic industry in Somero. The Li, Cs, and rare-element enrichment of some pegmatites was recognised in the early 19th century, and two Li-pegmatites with economic potential, Hirvikallio and Kietyönmäki, were discovered. The Geological Survey of Finland (GTK) investigated the Kietyönmäki occurrence in detail by surface trenching and mapping in 1983–1988. The results indicated that the Kietyönmäki pegmatite is considered to have the second-highest economic potential of hard-rock Li deposits in Finland (ca. 300 kt at 1.5 wt % Li2O, non-compliant resource), after the Keliber mine district in NW Finland, which was also discovered by GTK later in 2009. The Kietyönmäki pegmatite dyke swarm belongs to the rare-element (RE) LCT Li, spodumene–pegmatite type containing Li, Nb, Ta, and Sn mineralisation. It consists of a main dyke with large 5–25 m width and >150 m strike lengths with significant Li grades (>1 Li2O%) due to the abundance of fine-grained spodumene (SQIs). The SW dyke swarm is composed of narrow 0.3–2 m albite–pegmatite bodies with enrichment of CGMs, garnet, and apatite.
The modelling indicates that the pegmatite swarm contains at least six NW-trending dykes within a 200 m wide corridor with a strike length of at least 150 m NW–SE and with vertical to 70° SW dips. The main dyke (MD) is the most continuous along strike and depth and is the most consistently Li-mineralised. The main dyke of the Kietyönmäki deposit is well exposed on a >25 m long, 8–16 m wide, NNW-trending outcrop with steep vertical sides and inclusions of country rocks visible. The pegmatite consists of massive and even-grained white and light-grey material. On the hand specimen scale, only quartz, muscovite, and porphyritic K-feldspar are visible in a white fine-grained (0.1–2 mm) matrix of indistinguishable Li minerals. Several narrower (30 cm to 1.5 m) dykes are exposed in numerous smaller outcrops to the west of the main dyke.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

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


Mineral List


21 valid minerals.

Rock Types Recorded

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

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

ⓘ Albite
Formula: Na(AlSi3O8)
ⓘ Almandine
Formula: Fe2+3Al2(SiO4)3
Description: up to 39% of Spessartine component
ⓘ 'Apatite'
Formula: Ca5(PO4)3(Cl/F/OH)
ⓘ Arsenopyrite
Formula: FeAsS
ⓘ Beryl
Formula: Be3Al2(Si6O18)
ⓘ 'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘ Cassiterite
Formula: SnO2
ⓘ Columbite-(Fe)
Formula: Fe2+Nb2O6
ⓘ 'Columbite-(Fe)-Columbite-(Mn) Series'
ⓘ 'Columbite Group'
ⓘ 'Cymatolite'
ⓘ Elbaite
Formula: Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
ⓘ Fluorapatite
Formula: Ca5(PO4)3F
ⓘ 'Garnet Group'
Formula: X3Z2(SiO4)3
ⓘ Heterosite
Formula: (Fe3+,Mn3+)PO4
ⓘ 'K Feldspar'
ⓘ Lithiophilite
Formula: LiMn2+PO4
ⓘ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
ⓘ Petalite
Formula: LiAl(Si4O10)
ⓘ Purpurite
Formula: Mn3+(PO4)
ⓘ Quartz
Formula: SiO2
ⓘ Schorl
Formula: NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
ⓘ Spinel
Formula: MgAl2O4
ⓘ Spodumene
Formula: LiAlSi2O6
ⓘ Staurolite
Formula: Fe2+2Al9Si4O23(OH)
ⓘ 'Tantalite'
Formula: (Mn,Fe)(Ta,Nb)2O6
ⓘ Tantalite-(Fe)
Formula: Fe2+Ta2O6
ⓘ 'Tourmaline'
Formula: AD3G6 (T6O18)(BO3)3X3Z
ⓘ Triphylite
Formula: LiFe2+PO4
ⓘ Triphylite var. Ferrisicklerite
Formula: Li1-x(Fe3+xFe2+1-x)PO4
ⓘ 'Triphylite Group'
Formula: VIM1VIM2TO4
ⓘ Zircon
Formula: Zr(SiO4)

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘArsenopyrite2.EB.20FeAsS
Group 4 - Oxides and Hydroxides
ⓘSpinel4.BB.05MgAl2O4
ⓘQuartz4.DA.05SiO2
ⓘCassiterite4.DB.05SnO2
ⓘColumbite-(Fe)4.DB.35Fe2+Nb2O6
ⓘTantalite-(Fe)4.DB.35Fe2+Ta2O6
Group 8 - Phosphates, Arsenates and Vanadates
ⓘTriphylite
var. Ferrisicklerite		8.AB.10Li1-x(Fe3+xFe2+1-x)PO4
ⓘHeterosite8.AB.10(Fe3+,Mn3+)PO4
ⓘLithiophilite8.AB.10LiMn2+PO4
ⓘPurpurite8.AB.10Mn3+(PO4)
ⓘTriphylite8.AB.10LiFe2+PO4
ⓘFluorapatite8.BN.05Ca5(PO4)3F
Group 9 - Silicates
ⓘAlmandine9.AD.25Fe2+3Al2(SiO4)3
ⓘZircon9.AD.30Zr(SiO4)
ⓘStaurolite9.AF.30Fe2+2Al9Si4O23(OH)
ⓘBeryl9.CJ.05Be3Al2(Si6O18)
ⓘElbaite9.CK.05Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
ⓘSchorl9.CK.05NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
ⓘSpodumene9.DA.30LiAlSi2O6
ⓘMuscovite9.EC.15KAl2(AlSi3O10)(OH)2
ⓘPetalite9.EF.05LiAl(Si4O10)
ⓘAlbite9.FA.35Na(AlSi3O8)
Unclassified
ⓘ'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘ'Tantalite'-(Mn,Fe)(Ta,Nb)2O6
ⓘ'Tourmaline'-AD3G6 (T6O18)(BO3)3X3Z
ⓘ'Cymatolite'-
ⓘ'Columbite-(Fe)-Columbite-(Mn) Series'-
ⓘ'K Feldspar'-
ⓘ'Garnet Group'-X3Z2(SiO4)3
ⓘ'Apatite'-Ca5(PO4)3(Cl/F/OH)
ⓘ'Triphylite Group'-VIM1VIM2TO4
ⓘ'Columbite Group'-

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ⓘ ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Hⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Hⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Hⓘ StauroliteFe22+Al9Si4O23(OH)
Hⓘ ApatiteCa5(PO4)3(Cl/F/OH)
LiLithium
Liⓘ ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Liⓘ Triphylite var. FerrisickleriteLi1-x(Fex3+Fe2+1-x)PO4
Liⓘ LithiophiliteLiMn2+PO4
Liⓘ PetaliteLiAl(Si4O10)
Liⓘ SpodumeneLiAlSi2O6
Liⓘ TriphyliteLiFe2+PO4
BeBeryllium
Beⓘ BerylBe3Al2(Si6O18)
BBoron
Bⓘ ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Bⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Bⓘ TourmalineAD3G6 (T6O18)(BO3)3X3Z
OOxygen
Oⓘ AlbiteNa(AlSi3O8)
Oⓘ AlmandineFe32+Al2(SiO4)3
Oⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Oⓘ BerylBe3Al2(Si6O18)
Oⓘ CassiteriteSnO2
Oⓘ ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Oⓘ Triphylite var. FerrisickleriteLi1-x(Fex3+Fe2+1-x)PO4
Oⓘ Columbite-(Fe)Fe2+Nb2O6
Oⓘ Tantalite-(Fe)Fe2+Ta2O6
Oⓘ FluorapatiteCa5(PO4)3F
Oⓘ Heterosite(Fe3+,Mn3+)PO4
Oⓘ LithiophiliteLiMn2+PO4
Oⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Oⓘ PetaliteLiAl(Si4O10)
Oⓘ PurpuriteMn3+(PO4)
Oⓘ QuartzSiO2
Oⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Oⓘ SpinelMgAl2O4
Oⓘ SpodumeneLiAlSi2O6
Oⓘ StauroliteFe22+Al9Si4O23(OH)
Oⓘ Tantalite(Mn,Fe)(Ta,Nb)2O6
Oⓘ TourmalineAD3G6 (T6O18)(BO3)3X3Z
Oⓘ TriphyliteLiFe2+PO4
Oⓘ ZirconZr(SiO4)
Oⓘ Columbite-(Fe)-Columbite-(Mn) Series
Oⓘ Garnet GroupX3Z2(SiO4)3
Oⓘ ApatiteCa5(PO4)3(Cl/F/OH)
Oⓘ Triphylite GroupVIM1VIM2TO4
FFluorine
Fⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Fⓘ FluorapatiteCa5(PO4)3F
Fⓘ ApatiteCa5(PO4)3(Cl/F/OH)
NaSodium
Naⓘ AlbiteNa(AlSi3O8)
Naⓘ ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Naⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
MgMagnesium
Mgⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Mgⓘ SpinelMgAl2O4
AlAluminium
Alⓘ AlbiteNa(AlSi3O8)
Alⓘ AlmandineFe32+Al2(SiO4)3
Alⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Alⓘ BerylBe3Al2(Si6O18)
Alⓘ ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Alⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Alⓘ PetaliteLiAl(Si4O10)
Alⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Alⓘ SpinelMgAl2O4
Alⓘ SpodumeneLiAlSi2O6
Alⓘ StauroliteFe22+Al9Si4O23(OH)
SiSilicon
Siⓘ AlbiteNa(AlSi3O8)
Siⓘ AlmandineFe32+Al2(SiO4)3
Siⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Siⓘ BerylBe3Al2(Si6O18)
Siⓘ ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Siⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Siⓘ PetaliteLiAl(Si4O10)
Siⓘ QuartzSiO2
Siⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Siⓘ SpodumeneLiAlSi2O6
Siⓘ StauroliteFe22+Al9Si4O23(OH)
Siⓘ ZirconZr(SiO4)
Siⓘ Garnet GroupX3Z2(SiO4)3
PPhosphorus
Pⓘ Triphylite var. FerrisickleriteLi1-x(Fex3+Fe2+1-x)PO4
Pⓘ FluorapatiteCa5(PO4)3F
Pⓘ Heterosite(Fe3+,Mn3+)PO4
Pⓘ LithiophiliteLiMn2+PO4
Pⓘ PurpuriteMn3+(PO4)
Pⓘ TriphyliteLiFe2+PO4
Pⓘ ApatiteCa5(PO4)3(Cl/F/OH)
SSulfur
Sⓘ ArsenopyriteFeAsS
ClChlorine
Clⓘ ApatiteCa5(PO4)3(Cl/F/OH)
KPotassium
Kⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Kⓘ MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Caⓘ FluorapatiteCa5(PO4)3F
Caⓘ ApatiteCa5(PO4)3(Cl/F/OH)
TiTitanium
Tiⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
VVanadium
Vⓘ Triphylite GroupVIM1VIM2TO4
MnManganese
Mnⓘ Heterosite(Fe3+,Mn3+)PO4
Mnⓘ LithiophiliteLiMn2+PO4
Mnⓘ PurpuriteMn3+(PO4)
Mnⓘ Tantalite(Mn,Fe)(Ta,Nb)2O6
Mnⓘ Columbite-(Fe)-Columbite-(Mn) Series
FeIron
Feⓘ ArsenopyriteFeAsS
Feⓘ AlmandineFe32+Al2(SiO4)3
Feⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Feⓘ Triphylite var. FerrisickleriteLi1-x(Fex3+Fe2+1-x)PO4
Feⓘ Columbite-(Fe)Fe2+Nb2O6
Feⓘ Tantalite-(Fe)Fe2+Ta2O6
Feⓘ Heterosite(Fe3+,Mn3+)PO4
Feⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Feⓘ StauroliteFe22+Al9Si4O23(OH)
Feⓘ Tantalite(Mn,Fe)(Ta,Nb)2O6
Feⓘ TriphyliteLiFe2+PO4
Feⓘ Columbite-(Fe)-Columbite-(Mn) Series
AsArsenic
Asⓘ ArsenopyriteFeAsS
ZrZirconium
Zrⓘ ZirconZr(SiO4)
NbNiobium
Nbⓘ Columbite-(Fe)Fe2+Nb2O6
Nbⓘ Tantalite(Mn,Fe)(Ta,Nb)2O6
Nbⓘ Columbite-(Fe)-Columbite-(Mn) Series
SnTin
Snⓘ CassiteriteSnO2
IIodine
Iⓘ Triphylite GroupVIM1VIM2TO4
TaTantalum
Taⓘ Tantalite-(Fe)Fe2+Ta2O6
Taⓘ Tantalite(Mn,Fe)(Ta,Nb)2O6

Other Regions, Features and Areas containing this locality

Baltic Shield (Fennoscandian Shield)Shield
Eurasian PlateTectonic Plate
EuropeContinent

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

Wilke, Hans-Jürgen (1976) Mineralfundstellen - Ein Führer zum Selbstsammeln Vol. 4 - Skandinavien. Christian Weise Verlag. 370 pp.
Alviola, Reijo (1993). Tutkimustyöselostus Tammelan kunnassa, valtausalueella Kietyönmäki 1, Kaiv. Rek N:O 3991/1 suoritetuista teollisuusmineraalitutkimuksista. Geologian tutkimuskeskus M 06/2024/-93/1/85
Talikka, M., Vuori, S. (2010) Geochemical and boron isotopic compositions of tourmalines from selected gold-mineralised and barren rocks in SW Finland. Bulletin of the Geological Society of Finland, 82 (2). 113-128 doi:10.17741/bgsf/82.2.004
tupa.gtk.fi (n.d.) http://tupa.gtk.fi/raportti/valtaus/m06_2024_93_1_85.pdf
[1]Szentpéteri, K., Cutts, K., Glorie, S., O'Brien, H., Lukkari, S., Radoslaw, M. M., Butcher, A. (2024) First in situ Lu–Hf garnet date for a lithium–caesium–tantalum (LCT) pegmatite from the Kietyönmäki Li deposit, Somero–Tammela pegmatite region, SW Finland. European Journal of Mineralogy, 36 (3) 433-448 doi:10.5194/ejm-36-433-2024
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