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Union College Geology Department, Kurt Hollocher, Petrology Course, Igneous Lab: Iceland lavas 1 Citation Hyaloclastite deposits on the east side of Miðfell, on the east side of Þingvallavatn. This volcanic edifice was produced as the ice was thinning and an episode of decompression-induced primitive (picritic) volcanism. This is a view looking up. The core, delicious.com
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1 Citation Hyaloclastite -- The dark, lapilli-sized fragments are composed of siderlomelane (basalt glass), whereas the yellowish matrix is palagonite. The glassy basalt fragments formed by chill shattering of lava as it entered water, and the palagonite formed from, delicious.com
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