Tourmaline aplite - Priest's Cove
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Fact sheet
Description: 

This sample of aplite, a fine-grained quartz and feldspar-rich rock, is one of several thick veins intruded into highly folded, cordierite-bearing hornfelsed slates that are well exposed on the foreshore at Priest's Cove, Cape Cornwall, in Cornwall. The veins are probably related to the Carn Gloose granite to the south, which was intruded around 268 million years ago in the Permian period.

In thin section the rock exhibits coarse tourmaline grains with patchy zoned colours ranging from brown to pale blue/grey. The majority of the rock is formed of orthoclase feldspar, which appears to have been partly altered, and quartz.

In Place
In Time
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Location description: 
Priest's Cove, Cape Cornwall, Cornwall
Accuracy:
Location precision: 
Good
Timescale:
Timescale: 
Permian
Ma = Millions of years ago
In Focus
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Type:
Type: 
igneous
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