Granite Toumaline Pegmatite. Portsoy, Scotland

This is a thin section of Granite Pegmatite from Portsoy, Aberdeenshire, Scotland. This locality is well known for its 'Marble', actually a serpentine. A short distance away are some small granitic pegmatites with very interesting mineralogy. Containing blue tourmaline, rosettes of mica and small garnets in large pink orthoclase  feldspar which has a graphic intergrowth texture with quartz. I am not sure which mica this is, the books say muscovite, but it is unlike 'normal' muscovite both in its field occurrance and its appearance in thin section. Beryl is also sometimes found in this rock.


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