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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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  • El granito orbicular, también conocido como orbiculita, es una, roca ígnea plutónica (formada en profundidad) poco común,​ usualmente de composición granítica en sentido general. Estas rocas tiene orbículas (capas concéntricas de estructura esferoidal) probablemente formadas por nucleación en torno a un núcleo de crecimiento (grano mineral o xenolito), insertas en una roca granítica formadas en la cámara magmática magma en enfriamiento. Un rasgo común a los granitos orbiculares es su restricción a pequeños lentes, conductos y facies marginales ricas en agua del magma del cual cristalizaron y su desarrollo requiere la ausencia de núcleos de precipitación en el magma acompañado de un descenso en la temperatura del liquidus del fundido, forzando a que la cristalización ocurra sobre objetos sólidos como las restitas de biotita o cristales de cordierita.​ Casi un tercio de los granitos orbiculares conocidos son de Finlandia.​ (es)
  • 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. (en)
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  • Polished rock sample of orbicular granite from Mount Magnet, Western Australia. (en)
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  • Orbicular granite (en)
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  • Igneous (en)
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  • 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. (en)
  • El granito orbicular, también conocido como orbiculita, es una, roca ígnea plutónica (formada en profundidad) poco común,​ usualmente de composición granítica en sentido general. Estas rocas tiene orbículas (capas concéntricas de estructura esferoidal) probablemente formadas por nucleación en torno a un núcleo de crecimiento (grano mineral o xenolito), insertas en una roca granítica formadas en la cámara magmática magma en enfriamiento. Casi un tercio de los granitos orbiculares conocidos son de Finlandia.​ (es)
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  • Granito orbicular (es)
  • Orbicular granite (en)
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