Rhyolite and granite are both igneous rocks, meaning they are formed from cooled and solidified magma. However, they differ in their texture, mineral composition, and origin:

Texture:

* Rhyolite: Fine-grained, meaning the individual mineral crystals are too small to be seen with the naked eye. This is because it cools quickly at the surface.

* Granite: Coarse-grained, meaning the mineral crystals are large enough to be easily distinguished. This is because it cools slowly underground.

Mineral Composition:

* Rhyolite: Predominantly composed of quartz, feldspar (alkali feldspar), and minor amounts of biotite and hornblende.

* Granite: Also composed of quartz, feldspar (alkali feldspar and plagioclase), and minor amounts of mica (biotite and muscovite) and amphiboles (hornblende).

Origin:

* Rhyolite: Formed from the rapid cooling of felsic lava flows or small intrusions at the Earth's surface.

* Granite: Formed from the slow cooling of felsic magma deep within the Earth's crust.

Here's a table summarizing the key differences:

| Feature | Rhyolite | Granite |

|---|---|---|

| Texture | Fine-grained | Coarse-grained |

| Color | Often light-colored, but can be pink, gray, or black | Typically light-colored, often gray, pink, or white |

| Mineral Composition | Quartz, alkali feldspar, biotite, hornblende | Quartz, alkali feldspar, plagioclase, mica (biotite and muscovite), amphiboles (hornblende) |

| Origin | Formed from lava flows or small intrusions at the surface | Formed from magma deep within the Earth's crust |

In essence:

* Rhyolite is the extrusive equivalent of granite.

* Both rocks are felsic (rich in silica) and have a similar mineral composition.

* The main difference lies in their texture and origin, determined by their cooling conditions.

Let me know if you'd like to know more about either rock!