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Aphanitic Rock ... Aphanitic rock is igneous rock in which the grain or crystalline structure is too fine to be seen by the unaided eye. Such rock is formed when the material solidifies at or near the surface so that the cooling is rather rapid.
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hyperphysics.phy-astr.gsu.edu/HBASE/geophys/texture.htm...
hyperphysics.phy-astr.gsu.edu/HBASE/geophys/texture.html
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Aphanitic rocks have mostly invisible mineral grains. ... Aphanitic ("AY-fa-NIT-ic") rocks have mineral grains that are mostly too small to be seen with the naked eye or a hand lens, like this rhyolite...
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geology.about.com/od/more_igrocks/ig/igroxtextures/igte...
geology.about.com/od/more_igrocks/ig/igroxtextures/igtexaphanitic.htm
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Aphanitic texture consists of small crystals that cannot be seen by the eye with or hand lens. The entire rock is made up of small crystals, which are generally less than 1/2 mm in size. This texture results from rapid cooling in volcanic or hypabyssal (shallow subsurface) environments.
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geology.csupomona.edu/alert/igneous/texture.htm
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The more felsic aphanitic rocks tend to have isolated crystals and thus are examples of porphyritic textures with fine-grained groundmasses. (Basalt can also be porphyritic!);
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www.pitt.edu/~cejones/GeoImages/2IgneousRocks/IgneousTe...
www.pitt.edu/~cejones/GeoImages/2IgneousRocks/IgneousTextures/2FineGrained.html
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Crystalline rocks with mineral grains that cannot be distinguished from one another without magnification have an aphanitic igneous texture. Igneous rocks form by crystallization of minerals from liquid magma rising into the upper portion of Earth's crust from the lower crust and underlying mantle.
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www.enotes.com/earth-science/aphanitic
www.enotes.com/earth-science/aphanitic
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aphanitic. Dictionary terms for aphanitic in English, English definition for aphanitic, Thesaurus and Translations of aphanitic to English, French, Italian, Portuguese, Hebrew, Swedish. ... Define aphanitic...
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www.babylon.com/definition/aphanitic/English
www.babylon.com/definition/aphanitic/English
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Britannica online encyclopedia article on aphanitic texture (geology), ...categories are derived from the Udden-Wentworth scale developed for sediment. For igneous and metamorphic rocks, the terms are generally used as modifiers—e.g., medium-grained granite. ... Aphanitic is a descriptive term for small crystals,
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www.britannica.com/eb/topic-29489/aphanitic-texture
www.britannica.com/eb/topic-29489/aphanitic-texture
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Definition of aphanitic in the Online Dictionary. Meaning of aphanitic. Pronunciation of aphanitic. Translations of aphanitic. aphanitic synonyms, aphanitic antonyms. Information about aphanitic in the free online English dictionary and encyclopedia. ... aphanitic; Aphanitic rock; Aphanitic rock; aphanitism; Aphanius;
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www.thefreedictionary.com/aphanitic
www.thefreedictionary.com/aphanitic
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In aphanitic texture, individual crystals are so small that they cannot be seen without a microscope. Rocks with this texture appear to be massive and textureless. However, when a thin section of an aphanitic rock is viewed under a microscope, its crystalline structure is readily apparent.
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cmsc.minotstateu.edu/Labs/rockslab/Igneous/Aphantic%20t...
cmsc.minotstateu.edu/Labs/rockslab/Igneous/Aphantic%20texture.html
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