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Magmatism

4 items
Polished rapakivi granite with large round pale pink orthoclase crystals, each ringed by a greenish-grey rim, among smaller pink, green and black grains.
Rapakivi granite with typical round orthoclase crystals with oligoclase rims, Finland Sophie Graul
Close-up of coarse pink feldspar crystals with flat shiny faces and black patches between them, with the head of a blue geological hammer resting in the lower left.
Detail of K-feldspars pegmatite-like vein on the Kopparnäs coastline, Finland. Sophie Graul
Coastal cliff of dark grey and orange folded rock with a cave arch at its base above a beach of grey boulders, with waves breaking on the right.
Ponta da Abelheira Geology Nuno Correia
Person in a yellow hard hat and blue shirt standing by a tall dark grey cliff of steeply tilted layered sediments, crossed diagonally by a pale brown dyke, with a yellow case on the ground.
Mesozoic Lamprophyre dyke crosscutting Ordovician sediments near Leading Tickles, Newfoundland, Canada Alexander Peace

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