ophitic


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ophitic

[ä′fid·ik]
(petrology)
Of the holocrystalline, hypidiomorphic-granular texture of an igneous rock, exhibiting lath-shaped plagioclase crystals partly or wholly included within pyroxene crystals.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The unmetamorphosed NE-SW oriented Sigula intrusion in North Estonia consists of medium-grained gabbro-monzonitic rock with ophitic texture and of massive structure.
8.9 vs 11.4), texture and some details of mineralogy (e.g., Unit G is oniy slightly porphyritic and has analcite and ophitic augite, which A does not).
The quartz occurrences are all related to basic volcanic rocks known as ophites, a general term for diabases that have retained their ophitic texture (i.e.
The rocks are typically fine to medium grained with hypidiomorphic granular to locally ophitic texture involving amphibole and plagioclase (Fig.
3), and consist principally of fine-grained plagioclase laths and biotite with varying quantities of generally rounded and resorbed xenocrysts of K-feldspar and quartz; textures include doleritic, ophitic, and microgranular (Fig.
The basaltic rocks are generally fine-grained and porphyritic, with sub-ophitic to ophitic clinopyroxene, while the intersertal glass is charged with ore due possibly to devitrification.
Titanite ocelli (referred to as sphene-centered ocelli by Hibbard 1995) consist of titanite in ophitic intergrowth with plagioclase, surrounded by a felsic zone consisting of K-feldspar + quartz + plagioclasc.
The significance of flow structure in microporphyritic ophitic basalts of Arthurs Seat.
Petrographically the basalts are medium- to fine-grained with ophitic textures and are variably vitrophyric ([less than or equal to]30 %).