Granite and basalt are both igneous rocks, but they have different mineral compositions and crystal sizes, which directly affect their particle sizes.

Here's a breakdown:

Granite:

* Mineral composition: Primarily quartz, feldspar, and mica.

* Cooling process: Cools slowly underground (intrusive). This slow cooling allows for larger crystals to form.

* Particle size: Generally coarse-grained, meaning the individual mineral crystals are visible to the naked eye, often ranging from millimeters to centimeters.

Basalt:

* Mineral composition: Predominantly pyroxene and plagioclase feldspar.

* Cooling process: Cools rapidly at or near the surface (extrusive). This quick cooling leads to smaller crystals.

* Particle size: Typically fine-grained, with crystals often too small to be seen without magnification. Sometimes, basalt may have a porphyritic texture, which means larger crystals (phenocrysts) are embedded in a fine-grained matrix.

In summary:

* Granite: Coarse-grained, larger crystals

* Basalt: Fine-grained, smaller crystals (unless it's porphyritic)

Note: While the general rule is that granite is coarser-grained than basalt, there can be exceptions. Some granite varieties may be finer-grained, and some basalts can have larger crystals due to specific cooling conditions.