Granite is an igneous rock, which means it formed from cooled and solidified magma. This results in a crystalline texture, where the individual mineral grains are interlocked and often visible to the naked eye.

Here's a breakdown of the grain characteristics:

* Shape: The grains in granite are irregularly shaped and angular.

* Size: Granite typically has medium to coarse-grained texture, meaning the individual grains are visible without a magnifying glass.

* Arrangement: The grains are intergrown and interlocking, forming a strong and durable rock.

It's important to remember that the specific grain size and shape can vary within different granite types. Some varieties may have more prominent crystals, while others might have a more even, fine-grained texture.