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Definition of orbicule

Noun. A spheroidal, concentrically layered body, from a few mm to a few meters in diameter, found in some plutonic rocks, especially of granitic to dioritic composition, probably formed through relatively rapid nucleation in a cooling magma chamber.
See orbicular structure

Bevan, JC, and Bevan AWR, 2009, Nature and origin of the orbicular granodiorite from Boogardie Station, Western Australia: an ornamental stone of monumental proportions: The Australian Gemmologist (2009), v. 23, p. 373–432.

Fetherston, JM, 2010, Dimension stone in Western Australia, Volume 2, Dimension stones of the southern, central western, and northern regions: Geological Survey of Western Australia, Mineral Resources Bulletin 24, p. 35–43.

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