Here's why:

* Crystalline Structure: Granite is made of interlocking crystals of minerals like quartz, feldspar, and mica. These crystals are tightly bound together, giving granite its strength and resistance to deformation.

* High Strength and Hardness: Granite is a very hard and strong rock. Its high strength means it can withstand significant force without breaking or changing shape.

* Elasticity: While granite is rigid, it does have some elasticity. This means it can slightly bend under pressure but will return to its original shape when the pressure is released.

When you shake granite, the force you apply is not enough to overcome its strength and rigidity. The crystals within the rock will slightly vibrate, but their interconnectedness prevents them from moving significantly, so the overall shape of the granite remains unchanged.

Think of it like this: Imagine a tightly packed box of Legos. You can shake the box, but the Legos will stay in place because they are held together strongly. Similarly, the crystals in granite are "locked" together, making it resistant to change from shaking.