Granite porphyry, or porphyritic granite, polished specimen,size 90 x 81 mm. Porphyry is a type of igneous (magmatic) r ock consisting of large-grained crystals in a fine-grained matrix. (c) Jean-Claude Revy
Credit
ISM
/ Jean-Claude RÉVY
Dimensions
5100 x 3399 pixels
Print Size @ 300 dpi
17 x 11 inches / 43 x 29 cm
