Dunite peridotite – Isle of Skye
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Fact sheet
Description: 

This Paleogene age peridotite sample comes from the southern margin of a peridotite ring intrusion at Garbh-choire on the Isle of Skye, an area dominated by a major basic/ultrabasic central complex forming the Cuillin Hills. The intrusion, which is one of the largest of all the British Palaeogene plutonic/volcanic centres, contains a range of coarse-grained igneous rock types including gabbros, dunites, peridotites and allivalites, some of which display igneous layering indicating that this is an exhumed magma chamber.

The thin section is dominated by large cracked plates of olivine with unusually high birefringence colours (the thin section may be a little more than 30 microns thick), pale green grains of pyroxene with slightly lower relief and evidence of cleavage, plagioclase feldspar apparently filling pore spaces, and opaque chromite grains. 

In Place
In Time
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Location description: 
Garbh-choire, Isle of Skye
Accuracy:
Location precision: 
Good
Timescale:
Timescale: 
Paleogene
Ma = Millions of years ago
In Focus
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Type:
Type: 
igneous
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