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Peperite, Scotland

Gallery of Volcanic Rocks

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Peperite is a rock formed where magma meets water-saturated sediments at relatively shallow depths, such as in a maar. The lava tends to shatter, producing a breccia, and the sediment is vigorously disrupted. This example is from the Glencoe caldera complex in Scotland, exposed on the massif of Bidean nam Bian, where andesite magma invaded sediment that later became the Old Red Sandstone.
Where fire meets water
Photo courtesy Eddie Lynch of Flickr; all rights reserved
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