Phaneritic is a term usually used to refer to igneous rockgrain size. It means that the size of grains in the rock are large enough to be distinguished with the unaided eye as opposed to aphaneritic (which is too small to see with the naked eye). This texture forms by slow cooling of magma deep underground in the plutonic environment. Image File history File linksMetadata Rapakivigranite_ss. ... Image File history File linksMetadata Rapakivigranite_ss. ... Quarrying granite for the Mormon Temple, Utah Territory. ... Igneous rocks are formed when molten rock (magma) cools and solidifies, with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks. ... This article deals with grain size in the context of geology, see crystallite for grain size in materials science. ... The rocky side of a mountain creek near OrosÃ, Costa Rica. ... The human eye. ... ... Pluton redirects here. ...
monzonite: a phaneritic igneous rock that consists of nearly equal percentages of alkali-feldspar and plagioclase feldspar and 20-50 percent dark minerals, typically biotite and hornblende.
phanerite: term frequently used to describe igneous rocks the specific minerals of which can be identified with the naked eye.
syenite: phaneritic igneous rock the light colored mineral content which is wholly or largely alkali feldspar plus a dark mineral content (typically hornblende) that ranges between 10 and 35 percent.
Igneous rock of this type, where the individual mineral grains are apparent to the naked eye, is referred to as a "phanerite" and is usually intrusive.
Phanerites can be described as being either fine, medium, or coarse-grained.
For phanerites, which represent the majority of igneous climbing areas, this classification system is based upon the relative amounts of "felsic" and "mafic" minerals.
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