Hornblendite. Achmelvich, Scotland

This is a thin section microscope slide of Hornblendite. A most unusual rock. Collected from what appeared to be a dyke(?)  exposed on the shore at Achmelvich, Scotland. Contains 100% actinolite, silvery pale green in thin section, an absolute riot of colour with crossed polars. The actinolite is composed of short laths and lozenge shaped crystals showing characteristic amphibole cleavage angles. Similar to an illustration p45 Atlas of rock forming Minerals.

1 Slide

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