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.
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.
Unit G is oniy slightly porphyritic and has analcite and ophitic augite, which A does not).
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.
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 %).
In addition to the diabase dykes, small (up to 1 km diameter) oblate, equigranular to ophitic, gabbroic plugs intrude the Quoddy Formation.
Dark brown subhedral phenocrysts of Ti-rich amphibole are ophitic to subophitic and commonly have biotite replacement rims.