Granite, which is crystalline in its structure, often has tiny pits or spaces between the various mineral crystals. It’s hard to see them on a larger piece because the overall appearance is polished and mirror-like. Granite sometimes has natural fissures as well, which may look like cracks, but are not structural defects and are a naturally occurring result of the immense heat and pressure which formed the granite eons ago.
These characteristics are part of the natural beauty of stone and will not impair the function or durability of the material. A product of nature should not be expected to look man-made.