porphyritic


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Related to porphyritic: groundmass, Pegmatitic Texture

porphyritic

[¦pȯr·fə¦rid·ik]
(petrology)
Pertaining to or resembling porphyry.
References in periodicals archive ?
The bombs have a hypocrystalline, porphyritic, highly vesicular (50%) texture with plagioclase, clinopyroxene, orthopyroxene, and olivine phenocrysts in an intersertal matrix (Figs.
The rhyolite sheets are sparsely porphyritic, at places banded, and composed of perthite, quartz, albite, sodic amphibole, aegirine-augite, opaque oxide and titanite.
The gold-silver vein systems are hosted within porphyritic andesite and consist of structurally controlled, high-energy quartz-carbonate vein breccias, veinstockworks, and discrete smoky quartz veins containing fine-grained sulphide minerals.
The first exhibit balls (tephra balls) composed of a mixture of glassy porphyritic basalt fragments, crystal fragments of olivine, pyroxenes and zeolitized plagioclase admixed with organic matter, set in a groundmass of finer calcareous muddy material with crystal fragments, clays, analcime, calcite and organic matter.
In its thin sections, the rock has a hypo-crystalline matrix which is composed of porphyritic texture and is rich in a sprinkled opaque mineral, plagioclase, feldspathoid mineral and obsidian.
Prominent rock units include granite gneiss, migmatites, schist/ quartz schist, porphyritic granite, fine-medium grained granite and charnockite.
Rock samples were found to be fresh to slightly weathered showing porphyritic to hypidiomorphic texture.
For many people passing through Fitchburg, the most striking feature of the city is the Rollstone Boulder, an enormous 100-ton chunk of porphyritic granite that once crowned Rollstone Hill.
The host rock at Buccaneer is a porphyritic syeno-monzonite (a rock similar to granite).