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Brennseter Mica Prospect, Skien, Telemark, Norway

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Name in Norwegian:Brennseter, Skien, Telemark, Norge
Latitude & Longitude (WGS84): 59° 19' 2'' North , 9° 33' 49'' East
Latitude & Longitude (decimal): 59.31726,9.56363
GeoHash:G#: u4wc3wkh0
Locality type:Prospect
Köppen climate type:Dfb : Warm-summer humid continental climate
Other/historical names associated with this locality:Kråkesølvgruva

A small prospect ca. 250 m North of Brennseter, only 1,5m long, 1,5m high and 1m broad, following a nepheline-syenite pegmatite vein.

Regions containing this locality


Region - 2,024 mineral species & varietal names listed

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Standard Detailed Strunz Dana Chemical Elements

Commodity List

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

Mineral List

6 valid minerals.

Rock Types Recorded

Note: this is a very new system on and data is currently VERY limited. Please bear with us while we work towards adding this information!

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Alphabetical List Tree Diagram

Detailed Mineral List:

Reference: Larsen, A. O. (1993): Gruver og skjerp i Skien. Stathelle 1993. 72p (p.11)
'Clinopyroxene Subgroup'
Description: in the aegirine-diopside series
Reference: Larsen, A.O. (1993): Gruver og skjerp i Skien. Stathelle 1993. 72p
Formula: Fe2+Fe3+2O4
Reference: Larsen, A.O. (1993): Gruver og skjerp i Skien. Stathelle 1993. 72p
Formula: Na2Al2Si3O10 · 2H2O
Reference: Larsen, A.O. (1993): Gruver og skjerp i Skien. Stathelle 1993. 72p
Natrolite var: Spreustein
Formula: Na2Al2Si3O10 · 2H2O
Reference: Larsen, A.O. (1993): Gruver og skjerp i Skien. Stathelle 1993. 72p
Formula: Na3K(Al4Si4O16)
Reference: Larsen, A.O. (1993): Gruver og skjerp i Skien. Stathelle 1993. 72p
'Nepheline syenite pegmatite'
Reference: Larsen, A. O. (1993): Gruver og skjerp i Skien. Stathelle 1993. 72p (p.11)
Formula: KMg3(AlSi3O10)(OH)2
Reference: A. O. Larsen, 1993, "Gruver og skjerp i Skien", p. 11.
Formula: Ca3(Ti,Fe3+)2((Si,Fe3+)O4)3
Reference: Larsen, A.O. (1993): Gruver og skjerp i Skien. Stathelle 1993. 72p
Formula: CaTi(SiO4)O
Reference: Larsen, A.O. (1993): Gruver og skjerp i Skien. Stathelle 1993. 72p

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Group 9 - Silicates
'Natrolite'9.GA.05Na2Al2Si3O10 · 2H2O
var: Spreustein9.GA.05Na2Al2Si3O10 · 2H2O
Unclassified Minerals, Rocks, etc.
'Clinopyroxene Subgroup'-
'Nepheline syenite pegmatite'-

List of minerals arranged by Dana 8th Edition classification

Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework Feldspathoids and related species
Group 77 - TECTOSILICATES Zeolites
Zeolite group - True zeolites
Natrolite77.1.5.1Na2Al2Si3O10 · 2H2O
Unclassified Minerals, Rocks, etc.
'Clinopyroxene Subgroup'-
var: Spreustein
-Na2Al2Si3O10 · 2H2O
'Nepheline syenite pegmatite'-

List of minerals for each chemical element

H NatroliteNa2Al2Si3O10 · 2H2O
H PhlogopiteKMg3(AlSi3O10)(OH)2
H Natrolite (var: Spreustein)Na2Al2Si3O10 · 2H2O
O MagnetiteFe2+Fe23+O4
O NatroliteNa2Al2Si3O10 · 2H2O
O NephelineNa3K(Al4Si4O16)
O PhlogopiteKMg3(AlSi3O10)(OH)2
O SchorlomiteCa3(Ti,Fe3+)2((Si,Fe3+)O4)3
O Natrolite (var: Spreustein)Na2Al2Si3O10 · 2H2O
O TitaniteCaTi(SiO4)O
Na NatroliteNa2Al2Si3O10 · 2H2O
Na NephelineNa3K(Al4Si4O16)
Na Natrolite (var: Spreustein)Na2Al2Si3O10 · 2H2O
Mg PhlogopiteKMg3(AlSi3O10)(OH)2
Al NatroliteNa2Al2Si3O10 · 2H2O
Al NephelineNa3K(Al4Si4O16)
Al PhlogopiteKMg3(AlSi3O10)(OH)2
Al Natrolite (var: Spreustein)Na2Al2Si3O10 · 2H2O
Si NatroliteNa2Al2Si3O10 · 2H2O
Si NephelineNa3K(Al4Si4O16)
Si PhlogopiteKMg3(AlSi3O10)(OH)2
Si SchorlomiteCa3(Ti,Fe3+)2((Si,Fe3+)O4)3
Si Natrolite (var: Spreustein)Na2Al2Si3O10 · 2H2O
Si TitaniteCaTi(SiO4)O
K NephelineNa3K(Al4Si4O16)
K PhlogopiteKMg3(AlSi3O10)(OH)2
Ca SchorlomiteCa3(Ti,Fe3+)2((Si,Fe3+)O4)3
Ca TitaniteCaTi(SiO4)O
Ti SchorlomiteCa3(Ti,Fe3+)2((Si,Fe3+)O4)3
Ti TitaniteCaTi(SiO4)O
Fe MagnetiteFe2+Fe23+O4
Fe SchorlomiteCa3(Ti,Fe3+)2((Si,Fe3+)O4)3

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

Permian - Carboniferous
251.902 - 358.9 Ma

ID: 3143423
Carboniferous granite

Age: Phanerozoic (251.902 - 358.9 Ma)

Lithology: Major:{granite group}, Minor{monzonite,syenite,plutonic ultramafic 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]

251.902 - 298.9 Ma

ID: 3191892
Paleozoic intrusive rocks

Age: Phanerozoic (251.902 - 298.9 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]

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


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Larsen, A. O. (1993) Gruver og skjerp i Skien. Stathelle 1993. 72p. (p.11)

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