Lewisian Gneiss

This is the oldest of my rock samples. It is Lewisian Gneiss from the North West of Scotland. It is about 3,000 million years old – two thirds of the age of the Earth. It can be identified by its colour – usually pink and the intermittent horizontal bands of minerals – usually dark to black.
It is the oldest rock found in the UK and has been through many transformations. It is named after the island of Lewis in the Outer Hebrides.
It was caught up in the Caledian orogeny and so is found in the head walls of the thrust faults of that time.

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