Road from Västrum to Skaftet. Park at Västrums church at the exit of Västrum.
The outcrop is located at the roadcut close to Västrums church. The exposed rock
is characterized by a heterogeneous mingling of a leucocratic and a granodioritic granite type
(cf. fig. 4.15a-c) which was called Skaftet Granite by Frei (1997). This special granite type can also be
found at several other locations between the villages Västrum and Skaftet, e.g. at the bus
stop Bäckemåla (R: 1546523 - H: 6392314) and at an
outcrop in Skaftet (R: 1546940 - H: 6391670).
The leucocratic granite is medium- to coarse- and irregular-grained. It is light red in color. Essential
minerals are quartz, alkali feldspar and plagioclase giving a alkali feldspar granitic to granitic composition
(cf. Streckeisen diagram, appendix fig. 3, field 2 and 3). According to Frei (1997), mafic minerals only occur
as a minor component (biotite, chlorite) with a maximum of 5 vol.%. Biotite is often accumulated in nests
(cf. fig. 4.15e).
The dark colored variety is a granite-granodiorite type (cf. Streckeisen diagram, appendix fig. 3, field
3 and 4). It is also medium- to coarse- but regular-grained and gray-red in color. In thin section the main
components are plagioclase, K-feldspar, and quartz. The amount of mafic components, i.e., biotite, titanite
(sphene) and amphibole with 2530 vol.% is significantly higher than in the leucocratic type (cf. fig. 4.15e).
Feldspars cause a relief on the weathered surface. Biotite sometimes occurs in an irregular alignment and may be
interpreted as a flow fabric.