|Latitude & Longitude (WGS84):||58° 32' 8'' North , 7° 55' 28'' East|
|Latitude & Longitude (decimal):||58.53576,7.92463|
|Other regions containing this locality:||Scandinavia|
|Köppen climate type:||Dfc : Subarctic climate|
|Name(s) in local language(s):||Birkeland 4 (Røykvartsbruddet; Gadolinittbruddet), Birkeland, Iveland kommune, Aust-Agder fylke, Norge|
A granite pegmatite hosted in amphibolite located about 500 m north of the Birkeland farm. A small quarry is worked on the pegmatite, in the eastern part of it.
The quarry was started by Gustav Eftevann in 1906 (Frigstad 1968).
In 1968 it was reported that the quarry had produced about 100 kg of gadolinite and 200 ton of microcline. The quarry is also famous for a find of a large cavity containing very nice and large quartz crystals. The story goes that these crystals initially were discarded and thrown on the dumps.
Several decades later, when mineral tourism was gaining momentum, someone remembered the quartz crystals and the whole dump was emptied.
In the collections of the Evje og Hornnes geomuseum Fennefoss and the Iveland municipality mineral collection, several nice samples can be seen.
The largest specimen at Fennefoss weighs well over 50 kg (!).
Commodity ListThis is a list of exploitable or exploited mineral commodities recorded at this locality.
27 valid minerals.
Rock Types Recorded
Select Rock List TypeAlphabetical List Tree Diagram
Entries shown in red are rocks recorded for this region.
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
541 - 2500 Ma
|Proterozoic crystalline metamorphic rocks|
Age: Proterozoic (541 - 2500 Ma)
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. 
|Mesoproterozoic - Paleoproterozoic|
1000 - 2500 Ma
|Proterozoic I gabbro|
Age: Proterozoic (1000 - 2500 Ma)
Description: undifferentiated metamorphic
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.