Approximately 90% of Iceland's bedrock is basalt, a dark fine-grained igneous rock formed when basaltic magma cools rapidly at the surface. Rhyolite, a pale silica-rich rock, forms Iceland's multicoloured highland mountains such as Landmannalaugar. Hyaloclastite, formed by lava erupting under ice or water, builds Iceland's flat-topped table mountains called tuyas.
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