Västerbotten

DESCRIPTION

Not ready yet!
tobedone

This is a list of some localities, not ready to get their own descriptions yet. For the following localities in Västerbotten there are separate pages :

Varuträsk lithium pegmatite, Skellefteå mining district.
Björkdal gold mine, Skellefteå mining district.
Innansjön limestone quarry, Burträsk.
Krångfors gold mine, Skellefteå mining district.
Umeå.

GEOLOGY

The geology of Västerbotten is very varying, from gneiss in the coastland, old volcanites in the Skellefteå mining district to the Caledonides in the west.

LITTERATURE

SGU Ca37 : Beskrivning till berggrundskarta över Västerbottens Län.
   Sven Gavelin, Oskar Kulling
   P A Norstedths och söner, Stockholm 1955

Mineral assemblage

Calcite,

Calcite
Calcite with a number of small sulphide crystals along a plane. From a calcite vein outside of Dorotea.
Collected 1990
(300 dpi, 600x450, 26k)

Calcite
More calcite from the same location, note the lines along the longest diagonal of the crystal face. This is a typical sign of calcite, in dolomite the lines is in the direction of the shortest diagonal.
Found in a calcite vein outside of Dorothea.
Collected 1990
(300 dpi, 600x450, 35k)

Vindeln.
This is the village i have grown up in. It's a small village about 55 km north west from Umeå.
Geologically it is lying in gneiss, but close to the borders of granites to the west and the gneisses of the coast.
Some prospecting for nickel ore have been done 15 km to the west from Vindeln. It went so far that a number of drillcores were taken, but then it all stopped.
Minerals I have found here is Biotite, muscovite, feldspar, quartz, blue green apatite, schorl (only as small rounded boulders) ....

???
This is the oldest specimenI have in my collection. When I was a small boy doing what small boys usually does, digging a cave in the mud behind my grandmothers place ;-) I found this in the sand.
It is a concretion of sand cemented together by iron hydroxides. It is created when a root is changing the acidity in it's neighbourhood so much that iron is beginning to accumulate around the root. Left afterwards is a round tube in the sand.
Collected in 197x.
(300 dpi, 800x600, k)

Åsengruvan.
One of the numerous mines in the Skellefte field. I don't know more about this mine that it's been recultivated and there are nothing to be found at the site today.
I've never been there.

Fuchsite
Light green fuchsite with pyrite from Åsengruvan, Skellefteå mining district.
As a gift from Jorge Alves.
(300 dpi, 800x600, k)

Brännland quarry.
This is the closest quarry in Umeå, about 10 km from the centrum of the city. The rock in the quarry is used for building materials.
The geology in the quarry is simple. The main part consists of gneiss with a few granitic pegmatites with a few minerals dominating.
Minerals found here are Biotite (large books in the pegmatites), feldspar, rose quartz, lepidolite (according to a rumour), blue green apatite....

Biotite
Biotite is one of the more common minerals in the quarry, making up a major part of the gneiss. In the pegmatites are large rectangular books of biotite, up to 40 cm long in white feldspar. This sample is from one of the pegmatites.
Collected in 1998.
(300 dpi, 800x600, k)

If you have some questions, suggestions or comments you are welcome to write me a line or two.

Locality index. Main index.

axelsson@acc.umu.se

	Calcite Calcite with a number of small sulphide crystals along a plane. From a calcite vein outside of Dorotea. Collected 1990 (300 dpi, 600x450, 26k)
	Calcite More calcite from the same location, note the lines along the longest diagonal of the crystal face. This is a typical sign of calcite, in dolomite the lines is in the direction of the shortest diagonal. Found in a calcite vein outside of Dorothea. Collected 1990 (300 dpi, 600x450, 35k)
Vindeln. This is the village i have grown up in. It's a small village about 55 km north west from Umeå. Geologically it is lying in gneiss, but close to the borders of granites to the west and the gneisses of the coast. Some prospecting for nickel ore have been done 15 km to the west from Vindeln. It went so far that a number of drillcores were taken, but then it all stopped. Minerals I have found here is Biotite, muscovite, feldspar, quartz, blue green apatite, schorl (only as small rounded boulders) ....
	??? This is the oldest specimenI have in my collection. When I was a small boy doing what small boys usually does, digging a cave in the mud behind my grandmothers place ;-) I found this in the sand. It is a concretion of sand cemented together by iron hydroxides. It is created when a root is changing the acidity in it's neighbourhood so much that iron is beginning to accumulate around the root. Left afterwards is a round tube in the sand. Collected in 197x. (300 dpi, 800x600, k)
Åsengruvan. One of the numerous mines in the Skellefte field. I don't know more about this mine that it's been recultivated and there are nothing to be found at the site today. I've never been there.
	Fuchsite Light green fuchsite with pyrite from Åsengruvan, Skellefteå mining district. As a gift from Jorge Alves. (300 dpi, 800x600, k)
Brännland quarry. This is the closest quarry in Umeå, about 10 km from the centrum of the city. The rock in the quarry is used for building materials. The geology in the quarry is simple. The main part consists of gneiss with a few granitic pegmatites with a few minerals dominating. Minerals found here are Biotite (large books in the pegmatites), feldspar, rose quartz, lepidolite (according to a rumour), blue green apatite....
	Biotite Biotite is one of the more common minerals in the quarry, making up a major part of the gneiss. In the pegmatites are large rectangular books of biotite, up to 40 cm long in white feldspar. This sample is from one of the pegmatites. Collected in 1998. (300 dpi, 800x600, k)