SCORIA (FROTHY BASALT LAVA) - Myvatn, Iceland
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Mývatn, Sudur-Thingeyjarsysla, Iceland
Scoria is a dark-coloured volcanic rock containing numerous holes, or vesicles; but in contrast to pumice it is heavier and doesn’t float in water. It is frothy basaltic lava.
It is a typical product of a basalt volcano, and usually forms part of a lava flow. The cavities form when gases that were dissolved in the magma come out of solution when it erupts. An old name for scoria is volcanic cinder. Many volcanoes form what is called cinder cones, consisting mostly of scoria and volcanic ash that has been built around a volcanic vent.
This sample was collected in 1979.
Click on a picture for a larger imageSize: 8 x 8 x 6 centimetres
Weight: 284 grams
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