Wednesday, June 6, 2012

Orbicular granite

Orbicular granite (1st image) is an igneous rock that crystallized below the earth's surface. Characterized by spheroids that are thought to have formed around grains in the slowly cooling magma, it is rare and occurs most frequently in Finland. The rare rock is also found in Zimbabwe, South Africa, Australia, and New Zealand, and may be seen in situ in places including Chile (2nd image), Antarctica, and Ireland. When quarried, it is sliced into tabletops and shaped into spheres - small enough to hold in your hand or large enough to confound by floating on a thin layer of water.
Previous posts about rocks and stone:

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