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词汇 Orbicular granite
分类 英语词汇 英语翻译词典
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Orbicular granite

英语百科

Orbicular granite

Outcrop of orbicular granite near Caldera, Chile.
Close-up of orbicular granite near Caldera, Chile.

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. Almost one third of known orbicular rock occurrences are from Finland. The occurrences are usually very small.

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