Definitionadj. (of rocks) consisting of porphyry or containing large crystals in a fine groundmass of minerals
Last update: July 10, 2015
0
The rocks of its lower half are mainly granite and gneiss; its upper half is composed of porphyritic greenstone, and a variety of minerals occur. [Please select]
0
The soil, in fact, was bestrewn with quartz and porphyritic rocks. [Please select]
0
The Cumberland and Westmoreland hills are, in general, composed of clay-slate and gray-wacke, with occasional masses of chert[7] (like that which forms the summit of Scawfell), porphyritic greenstone, and syenite. [Please select]
Do you have a better example in your mind? Please submit your sentence!