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Holmtjärn, Stora Tuna, Borlänge, Dalarna, Swedeni
Regional Level Types
Holmtjärn- not defined -
Stora Tuna- not defined -
Holmtjärn, Stora Tuna, Bergslagen, Sweden

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Name(s) in local language(s):Holmtjärn
Latitude & Longitude (WGS84): 60° 21' 31'' North , 15° 15' 39'' East
Latitude & Longitude (decimal): 60.35889,15.26096
GeoHash:G#: u6dz77bxy
Köppen climate type:Dfc : Subarctic climate

Located 3 km SO of Idkerberget,and N of Rämshyttan railway station.
Coarse granite pegmatite, locally enriched in REE-minerals.

Regions containing this locality

Bergslagen, Sweden

Mining District - 804 mineral species & varietal names listed

Eurasia Plate

Plate - 7,319 mineral species & varietal names listed


Region - 2,040 mineral species & varietal names listed

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

7 valid minerals.

Detailed Mineral List:

Formula: {CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Reference: Natural History Museum, Stockholm collection # 19260362
'Feldspar Group'
Reference: Langhof, J. (1996): Thortveitite from granitic NYF pegmatites in Sweden. Geologiska Föreningens I Stockholm Förhandlinger 118, A54
Formula: Y2Si2O7
Reference: Radek Skoda, Inst Geol Sci, Masaryk Univ, Brno, Czech Republic
Formula: Ca(Y,Nd)2(CO3)4 · 6H2O
Colour: White
Fluorescence: None
Description: Silky white films of later formed Kimuraite-(Y) on yttrialite-(Y). Field of view: 40mm. Collected from the dump in 2014. Veryfied: By XRD, 2014, The Swedish Museum of Natural History. SEM-EDS, 2014,The Swedish Museum of Natural History.
Reference: Mikael Janssons Collection; Verified by Veryfied: By XRD and SEM-EDS, 2014, The Swedish Museum of Natural History.
Tengerite-(Y) ?
Formula: Y2(CO3)3 · 2-3H2O
Description: No data. No reference.
Formula: Y3Si3O10F
Reference: Natural History Museum, Stockholm collection # 19420038, 19420039
Formula: Sc2Si2O7
Habit: long prismatic crystals up to 10 cm
Colour: greyish green
Description: Contents high concentrations of mainly Y. "The Sc-and Y-rich silicate from Holmtjärnsgruvan may be a Y-dominant species" (Langhof 1996)
Reference: Langhof, J. (1996): Thortveitite from granitic NYF pegmatites in Sweden. Geologiska Föreningens I Stockholm Förhandlinger 118, A54
Formula: (Y,Th)2Si2O7
Reference: Bertil Otter photo

List of minerals arranged by Strunz 10th Edition classification

Group 5 - Nitrates and Carbonates
'Kimuraite-(Y)'5.CC.15Ca(Y,Nd)2(CO3)4 · 6H2O
'Tengerite-(Y)' ?5.CC.10Y2(CO3)3 · 2-3H2O
Group 9 - Silicates
Unclassified Minerals, Rocks, etc.
'Feldspar Group'-

List of minerals arranged by Dana 8th Edition classification

AmBn(XO3)p·xH2O, with (m+n):p < 1:1
Kimuraite-(Y),Nd)2(CO3)4 · 6H2O
Tengerite-(Y) ? · 2-3H2O
Group 55 - SOROSILICATES Si2O7 Groups,Generally with no Additional Anions
Si2O7 Groups, Generally with no Additional Anions with cations in [6] coordination
Group 58 - SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
Unclassified Minerals, Rocks, etc.
'Feldspar Group'-

List of minerals for each chemical element

H Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
H Kimuraite-(Y)Ca(Y,Nd)2(CO3)4 · 6H2O
H Tengerite-(Y)Y2(CO3)3 · 2-3H2O
C Kimuraite-(Y)Ca(Y,Nd)2(CO3)4 · 6H2O
C Tengerite-(Y)Y2(CO3)3 · 2-3H2O
O Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
O Keiviite-(Y)Y2Si2O7
O Kimuraite-(Y)Ca(Y,Nd)2(CO3)4 · 6H2O
O Tengerite-(Y)Y2(CO3)3 · 2-3H2O
O Thalénite-(Y)Y3Si3O10F
O ThortveititeSc2Si2O7
O Yttrialite-(Y)(Y,Th)2Si2O7
F Thalénite-(Y)Y3Si3O10F
Al Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Si Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Si Keiviite-(Y)Y2Si2O7
Si Thalénite-(Y)Y3Si3O10F
Si ThortveititeSc2Si2O7
Si Yttrialite-(Y)(Y,Th)2Si2O7
Ca Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Ca Kimuraite-(Y)Ca(Y,Nd)2(CO3)4 · 6H2O
Sc ThortveititeSc2Si2O7
Fe Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Y Keiviite-(Y)Y2Si2O7
Y Kimuraite-(Y)Ca(Y,Nd)2(CO3)4 · 6H2O
Y Tengerite-(Y)Y2(CO3)3 · 2-3H2O
Y Thalénite-(Y)Y3Si3O10F
Y Yttrialite-(Y)(Y,Th)2Si2O7
Ce Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Nd Kimuraite-(Y)Ca(Y,Nd)2(CO3)4 · 6H2O

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

1600 - 2500 Ma

ID: 637682
Igneous: extrusive; Extrusive: intermediate

Age: Proterozoic (1600 - 2500 Ma)

Description: Northern Europe, Svecofennian and Lapland-Kola orogens

Comments: Orogen, fold-thrust belt, folded region; Koistinen et al., 2001; Sigmond, 2002; Solli, unpublished compilation, 2007-08; Bergman et al., unpublished revisions, 2007-08

Lithology: Felsic and intermediate volcanic rocks

Reference: J.C. Harrison, M.R. St-Onge, O.V. Petrov, S.I. Strelnikov, B.G. Lopatin, F.H. Wilson, S. Tella, D. Paul, T. Lynds, S.P. Shokalsky, C.K. Hults, S. Bergman, H.F. Jepsen, and A. Solli. Geological map of the Arctic. doi:10.4095/287868. Geological Survey of Canada Map 2159A. [2]

1600 - 2500 Ma

ID: 3185452
Paleoproterozoic intrusive rocks

Age: Proterozoic (1600 - 2500 Ma)

Lithology: Intrusive igneous rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

1600 - 2500 Ma

ID: 3157968
Proterozoic I granodiorite-diorite

Age: Proterozoic (1600 - 2500 Ma)

Lithology: Major:{granodiorite-diorite group}, Minor{granite,syenite-monzonite group,meta-granodiorite-diorite group}

Reference: Asch, K. The 1:5M International Geological Map of Europe and Adjacent Areas: Development and Implementation of a GIS-enabled Concept. Geologisches Jahrbuch, SA 3. [147]

1800 - 2050 Ma

ID: 2634416

Age: Orosirian (1800 - 2050 Ma)

Description: Svecokarelian orogen; Bergslagen lithotectonic unit

Lithology: Gabbro, dioritoid, dolerite, ultrabasic rock and metamorphic equivalents

Reference: Bergman, S., M.B. Sephens, J. Andersson, B. Kathol, T. Bergman. Sveriges berggrund, skala 1:1 miljon. Sveriges geologiska undersökning K 423. [95]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License


Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
- Langhof, J. (1996): Thortveitite from granitic NYF pegmatites in Sweden. Geologiska Föreningens I Stockholm Förhandlinger 118, A54
- Sundius, N(1951): Kvarts, Fältspat och glimmer (in Swedish) SGU C 520

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