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Universalium. 2010.
orthophyric — /awr theuh fuy rik/, adj. Petrog. of or pertaining to a texture in which the groundmass is characterized by closely packed, short, quadrilateral crystals of feldspar larger than those in a trachytic groundmass. [ORTHO + PHYRE + IC] * * *… … Useful english dictionary
Trachyte — is an igneous, volcanic rock with an aphanitic to porphyritic texture. The mineral assemblage consists of essential alkali feldspar; relatively minor plagioclase and quartz or a feldspathoid such as nepheline may also be present. (See the QAPF… … Wikipedia
