The mineral composition of the granite porphyry is the same as that of the corresponding plutonic rock--granite, except that it has a porphyritic structure, indicating that it is an diagenetic rock.
The porphyry content of granite porphyry is generally 15-20%, mainly quartz and feldspar, and sometimes there are biotite and hornblende. Quartz plaques tend to be hexagonal and double-cone. Potassium feldspar is feldspar or translucent. Dark mica and hornblende are sometimes visible dark edges. The phenocrysts are usually ablated by the matrix and the matrix is ​​a micro-granite structure.
Granite porphyry is different from porphyritic granite, which has a plaque-like structure and belongs to a kind of granite; while granite porphyry has a porphyritic structure, not granite, but it is equivalent to its composition.
Granite porphyry is usually produced by small rock strains, rock tumors, rock disks, rock walls, or as intrusions in the late stage of the same period.
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