Here's why:
* Granite is a compositionally variable rock. It's defined by its mineral composition (mainly quartz, feldspar, and mica) and texture (large crystals). However, the specific proportions of these minerals can vary, resulting in different types of granite.
* Other rocks can be similar, but not identical. Some rocks share the same minerals as granite, but in different proportions, making them distinct. For example, rhyolite is a volcanic rock that has the same mineral composition as granite, but with much smaller crystals.
So, while no other rock is *exactly* like granite, some share similar mineral compositions, but with different textures or proportions.
