Porphyry (geology) - Wikipedia, the free encyclopedia
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Porphyry is a variety of igneous rock consisting of large-grained crystals, such as feldspar or quartz, dispersed in a fine-grained feldspathic matrix or groundmass. The larger crystals are called ph...
en.wikipedia.org/wiki/Porphyry_(geology)
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First discovered in ancient Thrace, the name for trachyte is generally believed to have been derived from a Greek word meaning “rough” or “coarse.” Such etymology is quite fitting since trachyte typically occurs as porphyry, a rock in which large, conspicuous crystals are set in a fine-grained matrix.
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micro.magnet.fsu.edu/primer/techniques/polarized/galler...
micro.magnet.fsu.edu/primer/techniques/polarized/gallery/pages/trachyteporphyrysmall.html
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Hydrocarbon reservoirs in sub-volcanic trachyte porphyries have not been reported. ... The Oulituozi trachyte porphyry ( Fig . 1) intruded into the third ...
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www.springerlink.com/index/LK85521475378220.pdf
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the trachyte porphyry. Plates of alkali-feldspar phenocrysts are aligned vertically in a cryptocrystalline matrix. A steeply dipping crack ...
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aapgbull.geoscienceworld.org/cgi/reprint/86/10/1821.pdf
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Figure 5 Textures of the trachyte porphyry and the contacts between the porphyry and the wall rocks. (A) Porphyritic texture of the trachyte porphyry. ...
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aapgbull.geoscienceworld.org/cgi/content/full/86/10/182...
aapgbull.geoscienceworld.org/cgi/content/full/86/10/1821/FG5
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Dacite, porphyry-gray (Not available at this time) ... Trachyte Porphyr ... Vitrophyre(Obsidian Porphyry...
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geoed.com/GE-Igneous10pkrock-pg.htm
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Trachyte was a very popular building material in ancient Rome, where it was also utilized for ornamental purposes and to pave roads. The large deposits that the Romans exploited for the material were located on the island of Sardinia.
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www.microscopy.fsu.edu/primer/techniques/polarized/gall...
www.microscopy.fsu.edu/primer/techniques/polarized/gallery/pages/trachyteporphyrylarge.html
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The 12 are biotite granite, granite, syenite, diorite, gabbro, trachyte porphyry, felsite, andesite, basalt, obsidian, pumice and scoria. Includes a key and a igneous rock chart. To view more igneous rock related items, click here.
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www.rocksandminerals.com/boxed/boxed.htm
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15 Trachyte porphyry. Orthoclase (zoned)(hematitic). Sericite, calcite, hematite, magnetite and sphene (few). Magnetite altered to hematite ...
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comp.uark.edu/~mattioli/geol_2313/lab8slides.pdf
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