Bjørkåsholmen, Asker, Akershus, Norwayi
| Regional Level Types | |
|---|---|
| Bjørkåsholmen | Nature Reserve |
| Asker | Municipality |
| Akershus | County |
| Norway | Country |
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Latitude & Longitude (WGS84):
59° 47' 30'' North , 10° 29' 54'' East
Latitude & Longitude (decimal):
Type:
Age:
~509 to 477.7 ± 1.4 Ma
Geologic Time:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Blakstad | 1,898 (2013) | 3.6km |
| Fjellstrand | 832 (2013) | 6.1km |
| Røyken | 2,775 (2014) | 7.9km |
| Fagerstrand | 1,990 (2013) | 8.1km |
| Billingstad | 2,349 (2013) | 9.3km |
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
Local clubs are the best way to get access to collecting localities
| Club | Location | Distance |
|---|---|---|
| Follo Geologiforening | Ås | 21km |
| Buskerud Geologiforening | Solbergelva | 24km |
| Steinklubben | Skjetten | 34km |
| Vestfold Geologiforening | Holmestrand | 39km |
Other/historical names associated with this locality:
Bjerkåsholmen
Other Languages:
Norwegian:
Bjørkåsholmen Naturminne, Asker, Akershus, Norge
Bjerkåsholmen locality 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 Gallery Strunz Chemical ElementsMineral List
6 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 DiagramDetailed Mineral List:
| ⓘ Baryte Formula: BaSO4 Description: As rosettes embedded in carbonate bed (sediments) of the lower Ordovician Bjøråsholmen Formation. References: |
| ⓘ Calcite Formula: CaCO3 Description: Reusch (1884) described pseudomorphoses of quartz and calcite after gypsum, later it was showed to be pseudomorphs after baryte. |
| ⓘ Glaucodot Formula: (Co0.50Fe0.50)AsS Description: Glaucodote occurs together with pyrite in the outhermost parts of pyrrhotite concretions. |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Pyrrhotite Formula: Fe1-xS |
| ⓘ Quartz Formula: SiO2 Description: Reusch (1884) described pseudomorphoses of quartz and calcite after gypsum, later it was showed to be pseudomorphs after baryte. |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Pyrrhotite | 2.CC.10 | Fe1-xS |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| ⓘ | Glaucodot | 2.EB.10c | (Co0.50Fe0.50)AsS |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| ⓘ | Baryte | 7.AD.35 | BaSO4 |
List of minerals for each chemical element
| C | Carbon | |
|---|---|---|
| C | ⓘ Calcite | CaCO3 |
| O | Oxygen | |
| O | ⓘ Baryte | BaSO4 |
| O | ⓘ Calcite | CaCO3 |
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Baryte | BaSO4 |
| S | ⓘ Glaucodot | (Co0.50Fe0.50)AsS |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Pyrrhotite | Fe1-xS |
| Ca | Calcium | |
| Ca | ⓘ Calcite | CaCO3 |
| Fe | Iron | |
| Fe | ⓘ Glaucodot | (Co0.50Fe0.50)AsS |
| Fe | ⓘ Pyrite | FeS2 |
| Fe | ⓘ Pyrrhotite | Fe1-xS |
| Co | Cobalt | |
| Co | ⓘ Glaucodot | (Co0.50Fe0.50)AsS |
| As | Arsenic | |
| As | ⓘ Glaucodot | (Co0.50Fe0.50)AsS |
| Ba | Barium | |
| Ba | ⓘ Baryte | BaSO4 |
Fossils
There are 1 fossil locality from the PaleoBioDB database associated with this locality.These data are provided on an experimental basis and are taken from external databases. Mindat.org has no control currently over the accuracy of these data.
| Occurrences | 41 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Youngest Fossil Listed | 485 Ma (Cambrian) | |||||||||
| Oldest Fossil Listed | 485 Ma (Cambrian) | |||||||||
| Stratigraphic Units |
| |||||||||
| Fossils from Region | Click here to show the list. | |||||||||
| Fossil Localities | Click to show 1 fossil locality |
Other Databases
| Wikipedia: | https://en.wikipedia.org/wiki/Bj%C3%B8rkasholmen_Formation |
|---|---|
| Wikidata ID: | Q17510129 |
Other Regions, Features and Areas containing this locality
Eurasian PlateTectonic Plate
- Baltic Shield
- Sveconorwegian BeltShield
EuropeContinent
Norway
- ⭔AkershusCounty
- Oslo Volcanic ProvinceVolcanic Province
- ⭔Viken (2020-2023)County
ScandinaviaRegion
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