Peridotite. Centre 3, Ardnamurchan, Scotland

This is a thin section of a rare volcanic rock, Peridotite. Widely written about, features in all the texts as the ultimate in ultrabasic rocks ( or maybe dunite) but rarely seen in an unaltered form. (relatively common as serpentine). This is from some large (100m plus) xenoliths in a remote part of the great eucrite, centre 3 Ardnamurchan. How and why they are there is a subject for much geological discussion. Slide contains over 50% good sharp olivine crystals with characteristic curved cracks and a small amount of alteration of the edge to Talc. Some augite and secondary chlorite and Plagioclase, well twinned and partial normal zoning, forms the rest of the slide.  Extra special

1 Slide

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