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Bjørkåsholmen, Asker, Akershus, Norwayi
Regional Level Types
BjørkåsholmenNature Reserve
AskerMunicipality
AkershusCounty
NorwayCountry

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Key
Latitude & Longitude (WGS84):
59° 47' 29'' North , 10° 30' 6'' East
Latitude & Longitude (decimal):
Locality type:
Age:
~509 to 477.7 ± 1.4 Ma
Geologic Time:
Nearest Settlements:
PlacePopulationDistance
Blakstad1,898 (2013)3.7km
Fjellstrand832 (2013)5.9km
Fagerstrand1,990 (2013)7.9km
Røyken2,775 (2014)8.0km
Billingstad2,349 (2013)9.4km
Other/historical names associated with this locality:
Bjerkåsholmen
Other Languages:
Norwegian:
Bjørkåsholmen Naturminne, Asker, Akershus, Norge


Bjerkåsholmen a promontory is protected by law as a Geological Nature Heritage Site (Geologisk Naturminne), being the reference- and typelocality for the lower Ordovician Bjerkåsholmen Formation.
All collection of rocks is strictly forbidden in the Nature heritage site!
The minerals are found in concretions in the limestone and shale beds of the Bjørkåsholmen Formation.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


6 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and 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:

Baryte
Formula: BaSO4
Description: As rosettes embedded in carbonate bed (sediments) of the lower Ordovician Bjøråsholmen Formation.
Reference: Henningsmoen, G. & Spjeldnæs, N. (1960): Palaezoic stratigraphy and palaeontology of the Oslo region, Eocambrian stratigraphy of the sparagmite region, Southern Norway. Int.Geol.Congr. XXI Session, Norway, guide-book. Norges Geologiske Undersøkelse 212n, 1-30 (p. 16)
Calcite
Formula: CaCO3
Description: Reusch (1884) described pseudomorphoses of quartz and calcite after gypsum, later it was showed to be pseudomorphs after baryte.
Reference: Antun, P. (1967): Sedimentary pyrite and its metamorphism in the Oslo region. Norsk Geologisk Tidsskrift. 47, 211-235.
Glaucodot
Formula: (Co0.50Fe0.50)AsS
Description: Glaucodote occurs together with pyrite in the outhermost parts of pyrrhotite concretions.
Reference: Antun, P. (1967): Sedimentary pyrite and its metamorphism in the Oslo region. Norsk Geologisk Tidsskrift. 47, 211-235.
Pyrite
Formula: FeS2
Reference: Antun, P. (1967): Sedimentary pyrite and its metamorphism in the Oslo region. Norsk Geologisk Tidsskrift. 47, 211-235.
Pyrrhotite
Formula: Fe7S8
Reference: Antun, P. (1967): Sedimentary pyrite and its metamorphism in the Oslo region. Norsk Geologisk Tidsskrift. 47, 211-235.
Quartz
Formula: SiO2
Description: Reusch (1884) described pseudomorphoses of quartz and calcite after gypsum, later it was showed to be pseudomorphs after baryte.
Reference: Antun, P. (1967): Sedimentary pyrite and its metamorphism in the Oslo region. Norsk Geologisk Tidsskrift. 47, 211-235.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Glaucodot2.EB.10c(Co0.50Fe0.50)AsS
Pyrite2.EB.05aFeS2
Pyrrhotite2.CC.10Fe7S8
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Baryte7.AD.35BaSO4

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Pyrrhotite2.8.10.1Fe7S8
AmBnXp, with (m+n):p = 1:2
Glaucodot2.12.6.1(Co0.50Fe0.50)AsS
Pyrite2.12.1.1FeS2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Baryte28.3.1.1BaSO4
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2

List of minerals for each chemical element

CCarbon
C CalciteCaCO3
OOxygen
O BaryteBaSO4
O QuartzSiO2
O CalciteCaCO3
SiSilicon
Si QuartzSiO2
SSulfur
S PyrrhotiteFe7S8
S PyriteFeS2
S Glaucodot(Co0.50Fe0.50)AsS
S BaryteBaSO4
CaCalcium
Ca CalciteCaCO3
FeIron
Fe PyrrhotiteFe7S8
Fe PyriteFeS2
Fe Glaucodot(Co0.50Fe0.50)AsS
CoCobalt
Co Glaucodot(Co0.50Fe0.50)AsS
AsArsenic
As Glaucodot(Co0.50Fe0.50)AsS
BaBarium
Ba BaryteBaSO4

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Henningsmoen, G. & Spjeldnæs, N. (1960): Palaezoic stratigraphy and palaeontology of the Oslo region, Eocambrian stratigraphy of the sparagmite region, Southern Norway. International Geological Congress. XXI Session, Norway, guide-book. Norges Geologiske Undersøkelse 212n, 1-30.
Antun, P. (1967): Sedimentary pyrite and its metamorphism in the Oslo region. Norsk Geologisk Tidsskrift. 47, 211-235.

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