A clean cut through rock
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A clean cut through rock

by Eva P. S. Eibl

A dyke forced its way through a fine-grained, layered volcanic rock that was eroded by wind, snow and rain at the eastern part of Dyngjufjöll in Iceland. The contact between dyke and host rock is a mm-thick, black, glassy layer while the dykes brown interior is glass altered by heat and water.