Orbicular granite
Orbicular granite (also known as orbicular rock or orbiculite) is an uncommon plutonic rock type which is usually granitic in composition. These rocks have a unique appearance due to orbicules - concentrically layered, spheroidal structures, probably formed through nucleation around a grain in a cooling magma chamber due to rapid physical changes. Almost one third of known orbicular rock occurrences are from Finland. The occurrences are usually very small.
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Rock
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Orbicular granite
Orbicular granite (also known as orbicular rock or orbiculite) is an uncommon plutonic rock type which is usually granitic in composition. These rocks have a unique appearance due to orbicules - concentrically layered, spheroidal structures, probably formed through nucleation around a grain in a cooling magma chamber due to rapid physical changes. Almost one third of known orbicular rock occurrences are from Finland. The occurrences are usually very small.
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Orbicular granite (also known ...... rences are usually very small.
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Polished rock sample of orbicular granite from Mount Magnet, Western Australia.
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composition
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Orbicular granite
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Igneous
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Orbicular granite (also known ...... rences are usually very small.
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Orbicular granite
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