See Also: orthophyre(dictionary)

orthophyre (iou)



orthophyre noun. L19.
[French, formed as ORTHO- + por)phyre PORPHYRY.]
Petrography. Porphyry in which the phenocrysts are chiefly of orthoclase.
ortho'phyric adjective having a groundmass containing short stout feldspar crystals of rectangular or quadratic cross-section L19.