Colour, properties:

Colour light to dark grey, also bluish or red. A bluish grey to dark green variety of syenite with blue-green iridescence is called larvikite.

- Light-coloured minerals: 60-100%

Of which:

Feldspar 80-100% Of which:

-alkali feldspar: 65-100%

-Plagioclase feldspar: 0-35%

Quartz 0-20% or Foide 0-10%

- Dark minerals: 0-40%

- Minor minerals:

Biotite, pyroxenes, zircon, apatite, magnetite, ilmenite

The structure of the syenite is medium to coarse-grained. The minerals are mixed together without any recognisable order. Syenite is compact, without perceptible cavities, very resistant to weathering.

Formation:

By very slow cooling of glowing molten rock in the depths of the earth's crust.

Locations:

Fichtelgebirge, Saxony, Western Alps, Portugal, Norway, USA (New Hampshire, Massachusetts), The syenite variety larvikite originates from Larvik at the Oslofjord in Norway.

Where found:

Used as ornamental stone, gravestone, for floor slabs and facades. Larvikite is a valued decorative stone.