Foid Syenite Thin Section Photos. Click on any photo for a larger image. Some of the larger images may be on other web sites and will open in a new window.

Foid Syenite Thin Section

fsynts_001. A nepheline syenite formed as part of the Borrlan intrusion from East of Legberg, Southland, Scotland. The sample contains large grains of orthoclase that exhibit simple twinning and “dusty” grains of nepheline. Other minor rock forming minerals include phlogopite mica and melanite garnet. Image from the UK Virtual Microscope.