2011
NM3019 : Detail of granite at Knockvologan
taken 13 years ago, near to Fidden, Isle of Mull, Argyll And Bute, Scotland
Detail of granite at Knockvologan
Granite at Knockvologan beach - this alkali-granite, approximately 414 million years old, is composed of potassium-rich orthoclase feldspar, and smaller amounts of plagioclase feldspar, together with quartz and biotite mica. At Knockvologan, the granite contains a darker material called tonalite, an igneous rock which was formed at the same time as the granite.
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