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; Porphyritic Textures with Fine-Grained Groundmasses ... This porphyritic texture indicates that the magma sat and cooled a bit below the Earth's surface, thus giving time for the large crystals to grow, before erupting onto the surface and cooling very quickly. The large crystals are termed phenocrysts while the aphanitic...
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www.pitt.edu/~cejones/GeoImages/2IgneousRocks/IgneousTe...
www.pitt.edu/~cejones/GeoImages/2IgneousRocks/IgneousTextures/4PorphyriticFineGrained.html
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A porphyritic texture displays minerals in two distinct size populations: one or more minerals are consistently larger than the rest of the minerals in a rock. The extra large mineral grains are called phenocrysts.
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www.pitt.edu/~cejones/GeoImages/2IgneousRocks/IgneousTe...
www.pitt.edu/~cejones/GeoImages/2IgneousRocks/IgneousTextures/3PorphyriticCoarseGrained.html
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Definition of porphyritic from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... Learn more about "porphyritic" and related topics at Britannica.com...
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mw1.merriam-webster.com/dictionary/porphyritic
mw1.merriam-webster.com/dictionary/porphyritic
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Definition of porphyritic from Webster's New World College Dictionary. Meaning of porphyritic. Pronunciation of porphyritic. Definition of the word porphyritic. Origin of the word porphyritic. ... Dictionary Home » Webster's New World College Dictionary » porphyritic...
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www.yourdictionary.com/porphyritic
www.yourdictionary.com/porphyritic
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Rocks with porphyritic texture have larger grains in a matrix of smaller grains. ... Rocks with porphyritic ("POR-fi-RIT-ic") texture like this andesite have larger mineral grains, or phenocrysts ("FEEN-o-crists"), in a matrix of smaller grains...
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geology.about.com/od/more_igrocks/ig/igroxtextures/igte...
geology.about.com/od/more_igrocks/ig/igroxtextures/igtexporphyritic.htm
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porphyritic - Scientific definition of porphyritic from A Dictionary of Earth Sciences at Encyclopedia.com ... The presence of porphyritic intrusives appear to have cut off the Tiger Zone gold horizon. These porphyritic intrusives and some of the proximal...The relationship between the porphyritic intrusives proximal to...
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www.encyclopedia.com/doc/1O13-porphyritic.html
www.encyclopedia.com/doc/1O13-porphyritic.html
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The beginner often makes the mistake of identifying porphyritic textured (see discussion below) aphanitic rocks as phaneritic. For the more felsic rocks like granite, phaneritic texture is rarely misidentified. But dark rocks like gabrro are more problematic.
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geology.csupomona.edu/alert/igneous/texture.htm
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Some authorities consider the expression "porphyritic rock" better usage than porphyry, since the term refers only to the texture of the rock-not its chemical, physical, or mineralogical composition or color. The texture is important in the determination of the circumstances under which the rock formed.
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www.answers.com/topic/porphyry
www.answers.com/topic/porphyry
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porphyritic also porphyritical adj. Of or containing porphyry. Containing relatively large isolated crystals in a mass of fine ... What are the crystal structures in porphyritic rocks?
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www.answers.com/topic/porphyritic
www.answers.com/topic/porphyritic
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